Hull and roughly chop the strawberries. Combine strawberries, granulated sugar, and 2 tbs water in a bowl. Muddle or gently mash until the sugar begins to draw juices from the fruit (about 5 minutes). Add packed basil leaves, gently muddle once or twice to bruise the herbs, then cover and refrigerate for 1 hour to macerate.

Strain the macerated mixture through a fine sieve or cheesecloth into a jar, pressing solids to extract as much liquid as possible. Discard solids or reserve for another use.

Stir the extracted fruit syrup with apple cider vinegar until combined. Taste and adjust: aim for a bright sweet-tart balance. Chill. Yield should be roughly 3/4 to 1 oz per 2 cups of starting fruit — use 1/2 oz shrub per cocktail.

Make honey syrup

Warm 1 tablespoon water and dissolve 2 tablespoons honey into it to make a pourable honey syrup. Cool to room temperature before using. (If using straight honey, be sure it mixes well into the cocktail.)

Citrus-Basil Foam (Garnish)

If using aquafaba, measure 1 tbsp aquafaba; if using egg white, separate one egg and reserve white. Combine the egg white or aquafaba, 1 tsp cold water, 1/4 oz lemon juice, 1/2 tsp simple syrup, 1 tsp finely minced basil, and 1/4 tsp lemon zest in a small container suitable for shaking or blending.

Dry-shake vigorously (no ice) for 20–30 seconds to build foam. If you have an immersion blender, blend for 10–15 seconds to create a stable microfoam. For a richer foam, add one small ice cube, shake again briefly, then strain out melted water before final use.

Chill the foam in the refrigerator while you prepare the cocktail; re-whip briefly right before finishing if it has settled.

Cocktail Assembly

Add 2 oz blanc vermouth, 3/4 oz fresh lemon juice, 1/2 oz strawberry-basil shrub, and 1/4 oz elderflower liqueur or cordial to a cocktail shaker.

Add the honey syrup you made (about 1/4 oz — if you prefer sweeter, add up to 1/2 oz). Add ice to the shaker (about 1 cup) and shake vigorously for 12–15 seconds until well chilled.

Double-strain the cocktail into a chilled coupe or Nick & Nora glass to remove ice shards and any pulp. Leave a small space at the top for the foam (about 1/2 inch).

Finish & Garnish

Gently spoon or pour the chilled citrus-basil foam on top of the cocktail to form a 1/4–1/2 inch layer. If needed, use the back of a spoon to help the foam settle smoothly.

Garnish with a thin strawberry slice on the rim, a small basil sprig laid across the foam, and optionally an edible flower. Express a little lemon zest over the surface for aroma.

Serve immediately.