Use culinary lavender, not decorative. This cannot be overstated. Decorative lavender sold at craft stores and flower markets is not food-safe and often carries pesticide residue. It can also taste harsh, camphorous, or soapy. Look for Lavandula angustifolia labeled specifically as culinary or food-grade. Specialty grocery stores, farmers markets, and online spice retailers all carry it.
Do not over-steep the syrup. Two tablespoons of lavender steeped for 15 minutes is the right ratio. More lavender or more time both push the syrup into soapy territory. If you want a more intensely flavored syrup, do not extend the steep time. Instead, add an extra teaspoon of lavender to the starting amount but keep the timing the same.
Make the syrup ahead. The lavender syrup keeps for up to two weeks in a sealed jar in the refrigerator. Making it in advance is the single best way to make this drink effortless for entertaining. The syrup deepens in color and mellows slightly in flavor over a day or two, which most people prefer.
Scale to a batch pitcher easily. For a pitcher serving eight, combine 2 cups vodka (or skip for a mocktail pitcher), 3 cups seedless lemon juice (about 16 lemons), and 1 cup lavender syrup in a large pitcher over ice. Stir well. Add one 1-liter bottle of chilled club soda just before serving. Do not add the club soda in advance or it will lose its carbonation.
Gin works beautifully here. If you prefer gin to vodka, it is an excellent swap. A London Dry or floral gin amplifies the lavender's aromatic character in a way that vodka, being neutral, does not. Hendricks, Empress 1908, or any botanical gin all work well. Use the same 2 oz. measure.
Adjust sweetness without changing the recipe. If the finished drink is sweeter than you prefer, add a squeeze of extra lemon juice rather than reducing the syrup. The syrup controls both sweetness and flavor, so cutting it back also dilutes the lavender character. Extra lemon juice brings the balance back without sacrificing the floral notes.
Store the syrup properly. Pour cooled syrup into a clean glass jar with a tight lid. Refrigerate immediately. The syrup will last up to two weeks. If you see any cloudiness or off smell before two weeks, discard it. Label the jar with the date so you always know where you stand.
The mocktail scales better than the cocktail. When making a non-alcoholic batch for a crowd, the mocktail version is significantly easier to calibrate because you are working with only three variables: lemon juice, syrup, and sparkling water. Mix the first two in advance, refrigerate, and top with sparkling water per glass. Guests can adjust their own carbonation level.
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