Ingredients:
- 1/2 pound tomatillos, coarsely chopped
- 1/4 cup chopped onion
- 1/4 cup fat-free sour cream
- 2 tablespoons chopped fresh cilantro
- 2 tablespoons cider vinegar
- 1 tablespoon fresh lime juice
- 1 teaspoon sugar
- 1/8 teaspoon kosher salt
- 1 avocado, peeled
- 1 serrano chile, seeded and chopped
Place tomatillos and next 9 ingredients (through serrano) in a food processor; process until smooth.