In large jar (that closes tightly) add the peel (no white if possible) and vodka, close the jar tightly and place in a dark closet or room and leave for 20 days. After the 20 days, boil the water and sugar until sugar dissolves about 5 minutes, let cool. Meanwhile strain through a sieve the alcohol and lemon mixture, then add the strained mixture with the cooled sugar and water syrup, mix. Let sit for 2 days at room temperature. Refrigerate for at least 5 hours before consuming. Serve straight up or over ice. Lasts up to a month. Enjoy! https://anitalianinmykitchen.com/limoncello/