Wash the fruit. Hull strawberries to remove stems, then quarter or dice them. (See Notes section below for tips on using frozen strawberries.)
1 cup strawberries
In a medium saucepan, bring water and strawberries to a boil. Lower the heat and bring to a simmer for 15 minutes or until reduced by half. Remove from heat.
1½ cup water, 1 cup strawberries
Pour the hot liquid through a fine-mesh strainer into a bowl or jar. Discard solids.
While still warm, add sugar to the strawberry mixture and stir until sugar dissolves.
½ cup granulated sugar
Stir in the basil leaves. Let cool completely, at least 30 minutes, to infuse the basil flavor. Discard leaves.
20-25 leaves fresh basil
Store in an airtight container for up to two weeks.
Strawberry Basil Margarita
Pour some sugar on a plate. Rub a lime wedge around the edge of a glass. Roll the rim of the glass in the sugar to coat the rim.
2 tablespoons coarse sugar, 1 wedge lime
In a cocktail shaker filled with ice, add strawberry basil syrup, tequila and lime juice. Blend until completely smooth.
Strain into a rocks glass with ice. Garnish with a strawberry slice sprig of basil.
1 slice fresh strawberry, 1 sprig fresh basil
Notes
Tequila: Silver (blanco) works great here, but añejo is even better if you have it — the deeper flavor pairs beautifully with the basil and strawberry.Frozen variation: Add all ingredients to the blender with 1 cup of ice, and blend well.