Ingredients: 1 1/2 cups sugar, 1 bunch fresh thyme (plus sprigs for garnish), juice of 6 lemons, juice of 2 limes, 6 cups cold water, slices of lime to garnish.
In a saucepan, bring the sugar, thyme, and 1 cup water to a boil until the sugar is dissolved. Take off the heat and leave the thyme to infuse for a couple of minutes . Stir in the juices and 6 cups of cold water; strain into a large pitcher. Refrigerate until cold.