Classic Onion Agua Fresca

1.Place the chopped onions and 2 cups of the water into a high-speed blender and process until completely smooth.

2.Pour the onion mixture through a fine-mesh sieve into a large pitcher, pressing down with a spoon to extract as much liquid as possible; discard the remaining pulp.

3.Stir the remaining 2 cups of water, agave nectar, and the tablespoon of fresh onion juice into the pitcher until the sweetener is fully dissolved.

4.Refrigerate the mixture for at least 30 minutes to allow the flavors to meld and the drink to chill thoroughly.

5.Serve over plenty of ice, garnished with a few thin slices of red onion if desired.