Zest the lemons and remove the white pithe. Place in a large container with the alcohol. Let sit for 1 to 2 weeks.
In a large pot, add the sugar and cream. Heat until the sugar has dissolved, about 5 minutes. Let this mixture cool completely. Add the lemon/alcohol mixture into the pot using a strainer to catch the zest. Pour mixture into 2 bottles. Store in refrigerator for 3-5 days before drinking.