Amaretto Sour Recipe: A Sweet and Tangy Crowd Favorite

Few cocktails split opinion the way the amaretto sour does. Bartenders who grew up on the sticky, sour-mix version dismissed it for years. But the amaretto sour recipe, made properly with fresh lemon juice and the right sweetener, is a well-balanced, genuinely delicious drink. This guide covers everything: the classic ratios, the egg white question, the bourbon upgrade that transformed the cocktail's reputation, and how swapping in Proof Syrup Traditional changes the sweetener slot from an afterthought into a real contributor.

What Makes a Great Amaretto Sour Recipe

The amaretto sour belongs to the sour family: a spirit base, fresh citrus, and a sweetener. The classic formula is simple. Two parts amaretto, one part fresh lemon juice, and a small amount of sweetener to fine-tune the balance. Most versions lean sweet because amaretto itself carries significant sugar. The goal is not to amplify that sweetness but to use the sweetener for body and depth, not just additional sugar.

That's where the choice of syrup matters. A plain simple syrup adds sweetness and nothing else. The result is a drink that reads as sweet-and-sour without much in the middle. Proof Syrup Traditional is made from raw cane sugar and brings genuine body and warmth to the glass. It integrates with the amaretto's almond and stone-fruit character rather than sitting flat beside it. In a cocktail this simple, that distinction is not subtle.

The Classic Amaretto Sour: Recipe and Ratios

This is the foundational version. Get this right first, then explore variations.

Ingredients:

• 2 oz amaretto
• 3/4 oz fresh lemon juice
• 1/4 oz Proof Syrup Traditional
• 1 egg white (optional, recommended)
• Garnish: maraschino cherry and orange slice

Instructions:

1. If using egg white, add all ingredients to a shaker with no ice. Seal and shake hard for 10 to 15 seconds. This is the dry shake and it builds the foam.
2. Add a large scoop of ice to the shaker.
3. Shake again for 10 to 12 seconds until the shaker is very cold.
4. Double-strain into a chilled coupe or rocks glass. If using a rocks glass, add fresh ice before straining.
5. Garnish and serve.

A note on ratios: amaretto is already sweet, so the sweetener here plays a supporting role at 1/4 oz rather than the full 3/4 oz you'd use in a whiskey sour. Taste your amaretto brand first. Some run sweeter than others and you may want to reduce to a bar spoon of syrup. Proof Syrup Traditional has enough richness that a small amount goes a long way.

Why the Sweetener Matters

In a three-ingredient cocktail, every component carries full weight. The amaretto handles the spirit and most of the sweetness. The lemon handles acid. The syrup's job is not to add more sweetness but to add texture, round the edges, and give the drink some backbone in the finish.

Proof Syrup is made in small batches from raw cane sugar with real flavor depth. The Traditional expression in particular has a richness that plain 1:1 simple syrup doesn't approach. Where simple syrup thins out at the finish, Proof Syrup Traditional lingers warmly. It's a small change in the glass that makes the whole drink feel more composed.

This is the same reason craft bars have shifted away from well-shelf sugar syrups. The sweetener slot is not a neutral position. It shapes texture, finish, and how well the other flavors integrate.

The Egg White Question

Egg white is optional in an amaretto sour but earns its place. A properly dry-shaken egg white creates a thick foam cap and a silky texture that transforms the mouthfeel of the drink. The amaretto sour's sweetness pairs especially well with the soft, pillowy quality a good foam adds. It rounds what might otherwise read as syrupy.

The technique is straightforward. Add the egg white with the other ingredients before ice, seal the shaker, and shake hard for a full 10 to 15 seconds. The absence of ice means no dilution during this phase, and the agitation emulsifies the egg white into the liquid. Then add ice and shake again. The second shake chills and dilutes. Double-strain to catch any ice chips.

If raw egg is a concern, pasteurized egg whites from a carton work well. Aquafaba (the liquid from a can of chickpeas) is a plant-based alternative that produces a similar foam; use about 3/4 oz in place of one egg white.

The Improved Amaretto Sour: Adding Bourbon

The most significant upgrade to the amaretto sour recipe involves a small amount of cask-strength or high-proof bourbon. This idea was popularized by Portland bartender Jeffrey Morgenthaler and it addresses a real structural problem with the classic version: amaretto alone is sweet, fragrant, and relatively low in proof, which makes the drink feel one-dimensional. Morgenthaler's version of the amaretto sour uses cask-strength bourbon to provide the backbone that makes the drink feel grown-up rather than candy-like.

The ratio is roughly 3 parts amaretto to 1 to 1.5 parts bourbon. You still lead with amaretto, but the bourbon adds proof, dry tannins, and a structural quality that balances the sweetness. The result is sharper, more complex, and more satisfying as a serious cocktail.

Ingredients (Improved Amaretto Sour):

• 1.5 oz amaretto
• 3/4 oz cask-strength or high-proof bourbon (100+ proof)
• 3/4 oz fresh lemon juice
• 1/4 oz Proof Syrup Traditional
• 1 egg white
• Garnish: maraschino cherry, expressed lemon peel

Instructions:

1. Combine all ingredients in a shaker without ice and dry shake for 15 seconds.
2. Add ice and shake again for 10 to 12 seconds.
3. Double-strain into a rocks glass over a large ice cube.
4. Express lemon peel over the foam, garnish, and serve.

The bourbon upgrades this from a sweet-forward liqueur cocktail to a balanced sour with real complexity. The dry shake with egg white is more important here than in the classic version: the foam layer creates a textural buffer between the strength of the bourbon and the sweetness of the amaretto.

Amaretto Sour Variations

The sweetener slot is where the most interesting customization happens. Each variation below uses a specific Proof Syrup product to take the cocktail in a distinct direction.

Ginger Amaretto Sour

Replace Proof Syrup Traditional with Proof Syrup Ginger. The spice cuts through amaretto's sweetness and adds a clean, bright finish that makes the drink feel lighter than it reads. This version pairs well with the improved ratio (adding bourbon), where the ginger warmth echoes the spirit's heat.

Ingredients:

• 2 oz amaretto (or 1.5 oz amaretto + 3/4 oz bourbon for the improved version)
• 3/4 oz fresh lemon juice
• 1/4 oz Proof Syrup Ginger
• 1 egg white

Best for: Spring and summer, guests who prefer less-sweet cocktails, those who enjoy spice-forward drinks.

Orange Amaretto Sour

Swap in Proof Syrup Orange and the citrus dimension doubles. The orange syrup deepens the lemon rather than competing with it, adding a warm, candied orange note that pairs naturally with amaretto's almond character. This is the most approachable variation on this list.

Ingredients:

• 2 oz amaretto
• 3/4 oz fresh lemon juice
• 1/4 oz Proof Syrup Orange
• 1 egg white
• Garnish: expressed orange peel

Best for: Brunches, guests new to amaretto cocktails, anyone who enjoys orange-forward cocktails.

Black Walnut Amaretto Sour

Proof Syrup Black Walnut adds an earthy, slightly bitter depth that works exceptionally well alongside amaretto's almond base. Almond and walnut are natural partners, and the bitterness in the walnut syrup keeps the drink from reading as overly sweet. This is the most sophisticated variation on the list.

Ingredients:

• 1.5 oz amaretto
• 3/4 oz bourbon
• 3/4 oz fresh lemon juice
• 1/4 oz Proof Syrup Black Walnut
• 1 egg white

Best for: Winter entertaining, guests who prefer dry or spirit-forward cocktails, pairing with cheese or nuts.

Pecan Amaretto Sour

Proof Syrup Pecan brings a toasted, warm sweetness that softens the lemon's edge and adds a distinctly Southern character. This is the most crowd-pleasing variation: accessible, flavorful, and approachable without being simple.

Ingredients:

• 2 oz amaretto
• 3/4 oz fresh lemon juice
• 1/4 oz Proof Syrup Pecan
• 1 egg white

Best for: Fall and winter, hosting mixed crowds, guests who prefer sweeter cocktails.

Technique Tips for a Better Amaretto Sour

A handful of habits separate a good amaretto sour from a great one.

Use Fresh Lemon Juice

Bottled lemon juice is flat and oxidized. Fresh-squeezed juice, used the same day, has a brightness that completely changes the drink. The case for fresh juice in the amaretto sour is clear: the tartness needs to be sharp enough to cut through amaretto's sweetness. Bottled juice doesn't have the edge for it. One medium lemon yields roughly 3/4 oz of juice, enough for one cocktail.

Double-Strain for a Clean Foam

A Hawthorne strainer catches ice chips. A fine-mesh strainer underneath catches any remaining ice fragments and egg white threads. Both together produce a clean, smooth foam cap rather than a rough one. This is worth the extra step.

Adjust the Sweet-Sour Balance by Brand

Different amaretto brands vary significantly in sweetness. Disaronno is relatively dry for amaretto. Others run sweeter. Taste your amaretto before building the cocktail and adjust the syrup accordingly. The 1/4 oz of Proof Syrup Traditional is a starting point, not a fixed rule. A particularly sweet amaretto might need no added sweetener at all.

Chill the Glass

A warm coupe or rocks glass pulls heat from the cocktail quickly. Fill your glass with ice water for 60 seconds while you prepare the drink, then discard and pour. The glass stays colder longer and keeps the drink in good condition through the last sip.

A Cocktail Worth Revisiting

The amaretto sour's reputation suffered for years because most versions were made carelessly: sour mix from a gun, warm glass, no egg white, no thought given to the sweetener. That version is not the drink's fault. Made correctly, with fresh lemon juice, a properly dry-shaken egg white, and a sweetener with real character, the amaretto sour is one of the most satisfying drinks in the sour family.

The bourbon upgrade takes it further. The Proof Syrup variations take it in different directions depending on the season, the crowd, or the mood. Any of these recipes are worth keeping close.

Browse the full range of Proof Syrup flavors to find the variation that fits your bar best.