by Molly Stevens, from www.epicurious.com

Ingredients:
10 cups 1-inch pieces peeled watermelon (from about 8-pound watermelon), seeded, divided
3 cups cold water, divided
1/3 cup fresh lime juice
1/4 cup (or more) sugar
1 1/2 tablespoons fresh ginger juice* (from one 3-ounce piece of ginger; see below for how-to)
Ice cubes
Lime wedges

Directions:
Place 2 1/2 cups watermelon and 3/4 cup cold water in blender. Puree until smooth. Pour agua fresca into large pitcher.

Repeat 3 more times with remaining watermelon and cold water.

Add lime juice, 1/4 cup sugar, and ginger juice to pitcher and stir
to blend. Add more sugar by tablespoonfuls, if desired.

Refrigerate until well chilled, at least 3 hours. Can be made 8 hours ahead. Keep chilled. Stir before serving.

Fill glasses with ice cubes; pour agua fresca over. Garnish each glass with lime wedge and serve.

Notes & Variations:
To make ginger juice, peel a 3-ounce piece of ginger and grate it over a plate. Wrap in cheesecloth; twist at both ends to squeeze out the juice; or, put the grated ginger in a fine mesh sieve and press to release the juices. You can also substitute bottled ginger ale or a stronger, less sweet non-alcoholic ginger beer from the grocery store, and omit the sugar.

Add sparkling water for a fun watermelon fresco soda!

For a delicious adult beverage, you can add vodka, gin, or tequila.