Sync Error Sour
A tangy and vibrant whiskey sour riff that blends tart grapefruit with honey and a smooth egg white foam for a perfectly balanced cocktail. This recipe, ready in about 8 minutes, brings together rye whiskey, fresh grapefruit juice, fresh lemon juice for a refreshing, crowd-pleasing drink — a bright, easy pour for parties, gatherings, or any warm-weather afternoon when you want something festive without alcohol-only options. Each serving lands at about 190 calories and feeds 1, so it works for entertaining, brunch, or a non-alcoholic option at the bar cart. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.
Ingredients
- 2 oz rye whiskey
- 3/4 oz fresh grapefruit juice
- 3/4 oz fresh lemon juice
- 3/4 oz honey syrup (1:1 honey to water)
- 1 large egg white
- 1 strip grapefruit twist
The shaker and jigger we’d mix this with → Best Bar Tools for 2026: Shakers, Jiggers & Strainers Worth Buying
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Equipment for this recipe
Tools this recipe's steps call for, with a link to each on Amazon.
Instructions
- Step 1: Add 2 oz rye whiskey, 3/4 oz fresh grapefruit juice, 3/4 oz fresh lemon juice, 3/4 oz honey syrup, and 1 large egg white into a cocktail shaker without ice.
- Step 2: Shake vigorously for 20 seconds to emulsify the egg white and create foam.
- Step 3: Add ice cubes to the shaker until full and shake again vigorously for 15 seconds until the shaker is frosty.
- Step 4: Double strain through a fine mesh strainer into a chilled coupe glass.
- Step 5: Garnish by expressing a grapefruit twist over the surface to release oils and place it delicately on the rim.
