Start by peeling 16 lemons with a vegetable peeler, avoiding the pith (white part.) Evenly divide them between the large containers. Evenly divide the 2 liters vodka or grain alcohol between the large containers, or until lemons are covered. Close tightly and set aside for 2-3 weeks.
In a large Dutch oven or stock pot, combine the 2 pounds sugar and 12 cups waterStir together over medium-high heat until mixture comes to a low boil and sugar has dissolved. Continue to simmer until mixture has reduced by a 1/4 making simple syrup. Remove from the heat and allow to cool completely.
Pour the alcohol mixture through a fine sieve or cheesecloth into 2 more clean containers.
Evenly divide the simple syrup between the two containers of lemon liqueur. Put the lid on tight and store for an additional 1-2 weeks. Shake or stir well before using.
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Notes
Make a simple Limoncello Spritz by adding 1 ounce of limoncello to a glass of sparkling white wine (Prosecco) with a splash of soda water and garnish with a lemon wedge and fresh mint. Limoncello can also be served cold as a sipper digestif or added to other cocktails recipes.