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sourstrongdry

Twentieth Century

Gin, Lillet Blanc, white crème de cacao and lemon — a 1930s cocktail built on an unlikely pairing of citrus and chocolate.

Difficulty
medium
Prep time
5 min
Strength
25% ABV
Glassware
Coupe glass
Base
gin
Serves
1

Ingredients

  • Gin
    45ml
  • Lillet Blanc
    25ml
  • White crème de cacao
    15ml
  • Fresh lemon juice
    20ml

Garnish: Lemon peel

Scale for a party

Method

  1. Add gin, Lillet Blanc, white crème de cacao and lemon juice to a shaker with ice.
  2. Shake hard for 10–15 seconds until very cold.
  3. Double-strain into a chilled coupe glass.
  4. Express a lemon peel over the drink to release its oils.
  5. Drop the peel in, or discard it, and serve immediately.

Equipment

Don't have everything? Here's what works instead.

  • Cocktail shaker

    Household swap: A clean jar with a tight-fitting lid, shaken firmly over the sink.

  • Fine strainer

    Household swap: A small kitchen tea strainer held over the glass for a cleaner pour.

Missing an ingredient?

Each swap below says what it changes and how to correct for it, so you can decide whether you are making this drink or a neighbouring one.

  • Instead of Lillet Blanc

    Best substitute: Dry Vermouth

    This is the modifier in this drink.

    Flavour impact: Produces a drier, less honeyed drink with a sharper herbal edge.

    What changes

    Expect less sweetness. Still a good drink, and a slightly different one.

    Sweetness ↓
    Less sweetness leaves the acid and the spirit more exposed, so the drink will taste sharper and drier than it should.
    Character
    Both are light, and you lose honeyed, citrusy and gently bitter, and you gain dry, herbal and crisp. Numbers can't see this: two ingredients can be identically sour and still smell nothing alike.

    To correct for it

    • Add a little more syrup, a small amount at a time, until the edges come back together.
    Moderate confidenceA workable substitute that changes the drink's balance somewhat.Shifts the drinkBecomes a variation

  • Instead of Crème de Cacao

    There's no close substitute for white crème de cacao's specific chocolate-vanilla note; omitting it removes an essential layer rather than approximating it.

Make it better

  • Use white (clear) crème de cacao, not the dark version — dark crème de cacao will muddy the colour and add unwanted molasses notes.
  • Keep the crème de cacao pour restrained; it should round out the drink, not turn it into a dessert cocktail.
  • Chill the coupe glass beforehand for the best temperature retention.
  • Shake hard for 12-15 seconds with plenty of ice — a proper shake chills and dilutes the drink in one step.
  • Use freshly squeezed citrus juice rather than bottled — the aromatic oils fade fast once juiced, so squeeze just before making the drink.
  • Express the citrus peel by pinching it, skin-side down, over the drink before dropping it in — this releases aromatic oils across the surface.

Rescue this drink

Tastes too sweet
Add 5ml more lemon juice to sharpen it back up.
Chocolate note is too strong
Reduce the crème de cacao to 10ml next time.
Tastes flat or one-note
Check the Lillet Blanc hasn't oxidised — it fades within a few weeks of opening if not refrigerated.
Too strong
Shake for a few seconds longer to add a touch more dilution.
Tastes thin, with no weight to itgeneral guidance
A short shaken drink with nothing rich in it depends on sugar and dilution for body. Try a slightly richer syrup — two parts sugar to one of water rather than equal parts — which adds weight without adding much more sweetness. Egg white or aquafaba does the same job more dramatically, and turns it into a sour.
You cannot smell itgeneral guidance
Most of a drink's aroma is on top of it, not in it. Squeeze the peel skin-side-down over the surface before dropping it in — the oil should visibly spray. A twist placed in the glass without being expressed contributes almost nothing. Aroma also fades fastest of anything in a drink, so garnish at the moment of serving rather than in advance.
Shaken too longgeneral guidance
Ten to fifteen seconds is a full shake. Beyond that the ice fractures and keeps diluting while you are still working, so the drink arrives cold, thin and slightly foamy when it should be sharp. Shake hard and briefly rather than gently and long — the two are not interchangeable.
Too sourgeneral guidance
Add a little more sweetener (simple syrup or the cocktail's usual sweetening ingredient), a small amount at a time.
Served too warmgeneral guidance
Chill the glass, ice and every ingredient ahead of time — a warm pour is the fastest way to lose a cold drink's balance. For one serving, there's no real fix beyond rebuilding it properly chilled; for a batch, keep everything refrigerated until the moment of serving and add ice last.
Over-diluted (tastes watery)general guidance
Likely shaken too long, or with too much ice surface area. For one serving there's no fixing it after the fact — rebuild with fewer, larger ice cubes and a shorter shake. Planning a batch? Shorten the ice-contact time across the whole round, not just this glass.
No cocktail shakergeneral guidance
A clean jar with a tight-fitting lid, shaken firmly over the sink.

Make ahead & storage

Batch the base, finish at serving

Batch the 3 stable components days ahead and add fresh lemon juice when you pour.

Add about 27% water to the batch to replace what the ice would otherwise contribute, or it will pour noticeably harsher than a fresh one.

Fresh lemon juice:
Fresh citrus loses its aroma within hours and turns dull. Squeeze it on the day.

What it tastes like

The taste, and what drives it

off-dry, sharp, light — a sour-structured drink served straight up, no ice.

Off-dry

Dry → Sweet

Sweetened enough to take the edge off without reading as a sweet drink.

What drives it: White crème de cacao — carries the most sugar into the glass.

Sharp

Soft → Sharp

Properly sharp. This is the axis the drink is built on.

What drives it: Fresh lemon juice — supplies the acidity.

Faintly bitter

Gentle → Bitter

A bitter edge you would only notice if you looked for it.

What drives it: Gin — provides the bitterness.

Light

Light → Rich

Light-bodied. It refreshes rather than satisfies, which is usually the intention.

What drives it: White crème de cacao — adds most of the weight.

Very bold

Delicate → Bold

Very bold — concentrated, and served small for that reason.

What drives it: Gin — is the most concentrated thing in the glass.

What you smell first

  • Citrus peelLeadsBefore the first sip

    From Gin, Lillet Blanc, Fresh lemon juice, Lemon peel

  • Juniper and botanicals

    From Gin

Aromas marked as sitting above the drink reach you before the first sip — skipping that garnish changes the drink more than its size suggests.

How it was worked out

Each reading comes from the recipe's own recorded taste scores combined with what each ingredient contributes, weighted by how much of it is in the glass. Almost everything in this drink has detailed ingredient data behind it.

How balance actually works →

If it isn't right

What goes wrong with this drink, and why

Only the faults this particular recipe is actually prone to — each with the likely cause, the adjustment, and what the adjustment costs you.

  • It's too sweet

    Likely cause
    White crème de cacao is carrying the sugar here, and it is the easiest thing in the drink to over-pour — syrup clings to a jigger and a "splash" is rarely the same twice.
    What to change
    Cut white crème de cacao by about a third and rebuild. If it is already made, a squeeze of citrus is faster than starting again.
    What that does
    The drink will read sharper as well as less sweet, because the acid stops being balanced. That is usually the intention, but it is a bigger change than it sounds.

  • It's too sour

    Likely cause
    Fresh lemon juice varies more than any other ingredient in the drink. Limes differ by weeks of ripeness, and a sharp one can be half again as acidic as a mild one at the same measure.
    What to change
    Add sweetener a few millilitres at a time rather than diluting — you are correcting a ratio, not a concentration.
    What that does
    Sourness recedes and the drink gains a little weight. Overshoot and you will be reading the too-sweet entry above instead.

  • It's too strong

    Likely cause
    Gin dominates by design here — this is a drink built to be sipped, and it is under-diluted more often than it is over-poured.
    What to change
    Shaking for longer, or add a measured 5–10ml of water. Both are the same correction; one is just more honest about it.
    What that does
    Alcohol heat drops and the aromatics open up — a slightly diluted spirit-forward drink usually smells better, not worse.

  • It's watery

    Likely cause
    Shaking adds water while it chills, and the two cannot be separated. Wet ice from a freezer door, or small cubes, will over-dilute before the drink is properly cold.
    What to change
    Use bigger, drier, colder ice and stop sooner. Chilling the glass first buys you time you would otherwise spend diluting.
    What that does
    More flavour concentration at the same temperature. Under-dilute instead and the drink will taste harsh — this is a target, not a direction.

  • It doesn't smell of anything

    Likely cause
    The aroma you are missing is probably citrus peel, which sits above the drink rather than in it — skipping or under-expressing the garnish removes it entirely.
    What to change
    Express the peel over the surface with the skin facing the drink, then drop it in. Herbs go in the glass, not on the side.
    What that does
    Aroma arrives before flavour does, so the whole drink reads as more intense without a single measure changing. The oil does land in the drink, though — an over-expressed peel adds a faint bitterness to the first mouthful.

  • It tastes one-dimensional

    Likely cause
    With 4 components there is nowhere for complexity to hide — a sour-structured drink is exposed by design, so a dull one is usually a dull ingredient rather than a missing step.
    What to change
    Change the quality of what is there before adding anything new: fresh citrus rather than bottled, a better base bottle, a dash of bitters. Bitters add layers at a scale nothing else matches.
    What that does
    More going on at the same strength and sweetness. Adding a whole extra ingredient instead usually produces a muddier drink rather than a deeper one.

Taste profile

Sweetness
2/5
Sourness
3/5
Bitterness
1/5
Strength
4/5
Fruitiness
1/5
Freshness
2/5
Creaminess
1/5
Smokiness
0/5

Nutrition & alcohol

Estimate onlyBased on a standard 45ml gin pour; crème de cacao sweetness varies somewhat between producers.
Calories
180 kcal
Sugar
9 g
Carbohydrates
10 g
Alcohol units (UK)
2.6
US standard drinks
1.48
ABV
25%
Serving size
105 ml
Show calculation assumptions

Source: Calculated from standard measures

Calorie breakdown: ~145 kcal from alcohol, ~35 kcal from sugar and mixers.

Likely range: 135–225 kcal, reflecting the confidence level above — not a lab-measured figure.

Assumes gin at 40% ABV, Lillet Blanc at 17% ABV and white crème de cacao at 25% ABV.

These figures are estimates, not laboratory measurements — individual tolerance to alcohol varies. See our responsible drinking guidance.

Variations

  • Vodka Twentieth Century

    Replace the gin with vodka for a softer, more neutral base that lets the Lillet and cacao lead.

  • Twentieth Century Highball

    Build over ice and top with soda water for a longer, lighter version.

What kind of drink this is

The structure behind the recipe

A shaken build: a sour-structured gin-based drink, served straight up, no ice — light and lively in the mouth.

Sour-structured

Something sour and something sweet held in balance over a base — the structure behind the whole sour family and everything descended from it.

  • Base

    Gin

  • Modifier

    Lillet Blanc

    White crème de cacao

  • Sour element

    Fresh lemon juice

Drinks built this way are collected as the Sour family.

Technique

shaken

Ice is thrown against the liquid and against itself, chipping fragments off and driving air through the mix. Chilling, dilution and aeration all happen at once and cannot be separated.

A lighter, briefly frothy body and a cloudy appearance that settles as it stands. The aeration blunts alcoholic heat, which is why a shaken drink tastes softer than a stirred one of the same strength.

What it ruins: Clarity, and any carbonation. A shaken spirits-only drink arrives cloudy with ice shards floating in it, and shaking anything fizzy is the one rule with no exceptions.

Everything about shaking →How the technique works →

Dilution

During mixing, then strained

Water from ice typically makes up around 30% of the finished drink for a shaken build (commonly 25–35%). Dilution is an ingredient here, not a side effect.

Why dilution is an ingredient →

Served

Straight up, no ice

Coupe glass · 105ml

Chilled during mixing and then strained away from the ice, so it arrives at its coldest and most concentrated and warms from the first sip — which is why 105ml is the right size for it.

Texture and aroma

Light and livelyLemon peel

Shaking whips air through the drink, giving a lighter, briefly frothy body that settles as it stands.

Aroma arrives before flavour does. A citrus twist is expressed over the surface so its oils sit on top of the drink — skipping it changes the drink more than its size suggests.

Where to go from here

Each of these is here because of something specific about this drink, not as a standard set of links.

Where it comes from

Origin and family

Origin of the Twentieth Century

American in origin, created in 1937, reportedly to mark the launch of the streamlined 20th Century Limited train service.

Family

Sour

2 parts spirit · 1 part citrus · 1 part sweetener — shaken, strained, served up or over ice.

1920–1933Other prohibition era drinks →

On drinks history

Cocktail origin stories are frequently repeated and rarely evidenced. Our history section separates what is documented from what is folklore rather than picking whichever version reads best.

History and culture →

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Related tools

Scale this for a party

Work out bottles, mixers, ice and total alcohol units for any number of guests.

Recipe confidence

A well-documented pre-war classic with a consistently recorded ratio.

High confidence