Step 1

Place the lemon zest in a quart Mason jar. Fill with vodka. Place the lid on the jar and tighten to finger tight.

Step 2

Set your sous vide to 135 degrees F.

Step 3

Once preheated, place the Mason jar in the water and cook for 2 hours.

Step 4

After 2 hours, allow the limoncello to cool to room temperature.

Step 5

While it cools, combine the water and sugar in a saucepan (you're making a simple syrup). Bring to a boil, whisking so that the sugar dissolves completely. Remove the mixture from the heat.

Step 6

Strain the lemon zest from the limoncello and combine the vodka mixture and simple syrup.

Step 7

Refrigerate in an airtight container.