Step 1In a half-gallon jar, muddle the strawberries and simple syrup with a wooden spoon. Stir in the vodka. Seal the jar and store in a cool, dark cabinet until the liquid smells and tastes strongly of strawberries, about 7 days.
Step 2Strain the mixture with a mesh strainer into a clean quart jar. Do not push on the solids to extract more liquid.
Step 3Seal and store in a cool, dark cabinet. Use within one year.