I found this recipe on allrecipes.com. I don't believe the title because the original recipe does not include chilled vodka (specifically Tito's Handmade Vodka). My recipe does include a liberal shot per glass. Enjoy!
1 3/4 C. white sugar
8 C. water
1 1/2 C. lemon juice
In a small saucepan, combine sugar and 1 C. water. Bring to boil and stir to dissolve sugar. Allow to cool to room temperature. then cover and refrigerate until chilled.
Remove seeds from lemon juice but leave pulp. In a pitcher, stir together chilled syrup, lemon juice and remaining 7 C. water.