2 cups ripe pineapple, peeled and cut into chunks
1/3 cup sugar, plus more, to taste
4 cups water, divided use
1/4 cup freshly squeezed lime juice
8 spearmint leaves (optional)
Ice cubes

Blend the pineapple, sugar and mint along with 4 cups of water in a blender until it is very smooth. Strain the pineapple mixture through a sieve, smashing the solids to force out as much juice as you can, and into a large pitcher. Gradually season the agua fresca to taste with more sugar and lime juice. Chill the pitcher in the refrigerator, then stir thoroughly; add the mint sprigs, if using, and pour the agua fresca into ice-filled glasses.