I have had homemade Limoncello many times, enough that I too have a recipe to make it.
My recipe calls for 24 lemons, large organic ones if you can get them, but find the largest that have a good lemon smell to them and no blemishes on the skin since the skin is all you use.
Wash the lemons and cut the skin off them being careful not to get any of the white pith beneath the yellow. If you get much of the white pith the liquor will be bitter and not that good.
Use a big crock or other container with a tight lid, you may need two. Wash and dry the container and place the lemon rind inside. Cover all with Everclear151 proof alcohol, do they still make the 180 proof Everlcear? You can use 100 proof vodka (50%) but it won't have quite the kick. Stop filling container when you get 2-3 inches from the top and seal the lid. Place in a cool dark place like the cupboard not the top of the fridge which is hot for 6-8 weeks. Some like to speed things up and finish after 3-4 weeks but longer is better. Might as well get 2 liters of Everclear and make a lot. This stuff is good.
Mix 4 1/2 cups sugar with 6 cups filtered water in a heavy sauce pan. Stir over medium heat till all the sugar is dissolved making a simple syrup. Let the syrup cool to room temp then bring out that crock of lemon and alcohol. Now you will probably need at least two containers since you need to mix all the syrup with the lemon and alcohol. I use a 3 gallon crock for this but I have seen some gallon size sun tea makers that would be ideal. Put the container back in the cool dark cupboard for another month. I know you want it now but good things come to those who wait.
Sterilize as many bottles as you think you will need. Use bottles you can close with a stopper, cork or something. Strain the Limoncello through some cheese cloth or coffee filters to remove all the lemon peel. The liquid should be a bright yellow in color, have a distinct lemon flavor without the bitterness of the juice.
Like SCrammerjammer said it is great straight from the freezer it will not freeze because of the alcohol. Drink it straight our use it to flavor ice tea, over sponge cake, in mixed drinks or to flavor sparkling water. Also good with champagne.
You can do this same thing with orange peel, ginger root and if you use coffee and vanilla beans you have homemade Kahlua.
All those lemons you cut the skin off? Make lemon pies or lemon juice.
Hey the scrambled eggs recipe wasn't bad.