Adapted from Martha Stewart
750 cc vodka
2 1/4 cups sugar
2 1/4 cups boiling water
Peel strips of zest from lemon taking care to remove only yellow portion. Combine zest and vodka in an airtight container. Let stand at room temperature 2-7 days.
Add sugar to boiling water and stir till sugar dissolves. Cool completely. Stir into vodka mixture. Refrigerate in airtight container overnight.
Pour liquid through sieve and into airtight bottles. Discard zest.
Can be kept in freezer up to 3 months.