Citrus Lemonade

1 cup white sugar, or to taste

4 lemons, juiced

4 limes, juiced

4 oranges, juiced

3 quarts cold water

1 lime, sliced into rounds

12 cups ice cubes

Pour the sugar, lemon juice, lime juice, and orange juice into a gallon-sized container; stir until the sugar has dissolved. Serve over ice with a slice of lime if desired.