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Ingredients
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Rhubarb Syrup
Cocktail Build
Method
Rhubarb Syrup
Prepare rhubarb
Wash the rhubarb stalks and trim off any leaves and tough ends. Chop the stalks into roughly 1/2-inch pieces until you have about 2 cups packed.
Cook syrup
In a small saucepan combine the chopped rhubarb, granulated sugar, water, and lime zest. Bring to a gentle simmer over medium heat, stirring to dissolve the sugar. Once simmering, reduce heat to low and cook for 8–10 minutes, stirring occasionally, until the rhubarb breaks down and the liquid becomes pink and fragrant.
Strain and cool
Remove the pan from the heat and let it cool for 5 minutes. Pour the mixture through a fine-mesh sieve set over a bowl, pressing on the solids with the back of a spoon to extract as much syrup as possible. Discard the solids. Let the syrup come to room temperature, then transfer to a clean jar and refrigerate until cold. Yields about 3/4 to 1 cup syrup.
Cocktail Build
Combine lime and syrup
In a small pitcher or mixing glass, combine 1 ounce fresh lime juice with 2 tablespoons chilled rhubarb syrup. Stir briefly to blend.
Assemble
Divide a few ice cubes among two short glasses if you prefer over ice, or leave glasses chilled and dry for a traditional sparkling presentation. Pour the lime-syrup mixture evenly into two glasses (about 1 tablespoon per glass).
Garnish and serve
Garnish each glass with two lime wheels or a wedge and a mint sprig if using. Serve immediately so the drink is crisp and effervescent.