Hugh Acheson's Chilled Avocado Soup With Crab And Yogurt

Ingredients

• 1 tablespoon olive oil
• 2 shallots
• 1/2 cup husked and chopped tomatillos
• 1 teaspoon minced jalapeno
• 1 cup chicken stock or vegetable stock
• 1/4 cup minced fresh cilantro stems
• 1/2 teaspoon grated lime zest
• 1 tablespoon plus 1 teaspoon freshly squeezed lime juice
• 2 large ripe California Hass avocados
• 1 cup plain yogurt
• kosher salt
• 1/2 pound tomatoes
• 1/2 pound crabmeat
• 2 tablespoons chopped fresh cilantro leaves