Six cubes ice from a standard tray
1/4 cup freshly squeezed lemon juice (if you don’t like pulp or seeds, don't forget to strain your juice)
1/4 cup sugar (or more to taste)
8 to 12 ounces water
Fill a 1-quart Mason jar to the 8-ounce line with ice. Add lemon juice and sugar. Fill to 16-ounce line with water (this will require about 8 ounces). Put a lid on the Mason jar and shake well. Taste it, and add up to 1/4 cup more sugar and up to 4 more ounces of water. The original recipe makes a very tart shake-up, perfect for people who love sour flavors. Garnish with two lemon peels cut into quarters.
Serve in the Mason jar with a straw, or pour into a large glass.