Roast 6 tomatillos over an open flame until the husks are charred, 5 minutes. Cool; remove the husks. Puree the tomatillos, 1 canned chipotle chile, 1 teaspoon adobo sauce, the juice of 1 lime, 1 garlic clove and 2 teaspoons olive oil. Thin with water. Season with salt.
Photograph by Con Poulos