About 16 lemons
1 cup sugar
1 750 ml bottle of very strong vodka or Everclear (Everclear works best)
1 empty mayonnaise jar (or any clear jar with a lid that is big enough)
Peel all the lemons into strips with as little of the white part as possible and put them in the mayonnaise jar (or any other clear sealable jar). They should go halfway to the top of the jar. A few more or less is not terribly important.
Add the cup of sugar first and then the liquor to within 1 inch of the top. Screw on the lid tightly and shake the mixture vigorously.
Place the jar on a windowsill and shake once or twice a day for 2 weeks. At the end of 2 weeks, strain the mixture into another container (a liquor bottle is a good choice) and place in the freezer.
Serve in very small, chilled glasses. (But be careful now, this stuff is potent!)