Limoncello and more From the Drunken Botanist, here's how to make limoncello the easier way according to author. Get a bottle of cheap vodka. Pour some into a mason jar. Peel the zest from your lemon making sure to only get the yellow part, no white. Put zest into jar. Fill to cover with vodka. I think it takes 10 days, but since you are a scientist you will want to test each day and jot down your observations.