1-Blend the ingredients: Combine 3–4 peeled limes (or their juice), ½ cup sweetened condensed milk, 3 tbsp sugar, 4 cups cold water, and ice in a blender. Blend on high for 30 seconds until frothy and pale green.

2-Strain and taste: Pour the mixture through a fine-mesh strainer into a pitcher to remove pulp or rind. Taste and adjust sweetness with sugar or condensed milk, or add more lime juice for tartness.

3-Serve: Serve over plenty of ice in tall glasses. Garnish with lime slices, zest, or mint. If you don’t have a blender, use a food processor.