Pour boiling water over juniper berries and cook over low heat for 2 minutes. Take out with a slotted spoon and pat dry with paper towels.
Pour the berries into a bottle. Cut the lemon zest into thin strips, add to the bottle.
Pour vodka into a saucepan, gently heat to 60ºС. Carefully pour the hot vodka into the bottle through the funnel, cork tightly. Insist 2 weeks, then strain.