Alcohol: Everclear 190 (1 1.75l bottle)
Lemons: 20 organic from Fresh Market
Simple Syrup: 10 cups water, 7 cups sugar
The simple syrup was the problematic step. Because the Everclear was 190, instead of 151 from the recipe, I would need much more simple syrup to get the alcohol content down to something drinkable. Ben at limoncelloquest.com recommends going down to 25% alcohol if you're giving it away as a gift, but I was worried that a gallon of simple syrup would make the whole thing much too sweet.
My friend A--- wisely pointed out that you can always put more simple syrup in, but you can't take it out. So I decided to double the "standard" recipe, putting in about 13.5 cups of simple syrup.
I've bottled it up, and am selectively handing out to friends to try, encouraging them to experiment with ways to offset the alcohol. A--- thinks she wants to try mixing in some whipping cream. My best success so far was with a very good Ginger Limoncello Fizz cocktail: a shot of limoncello, a shot of ginger ale, and a couple shots of seltzer.