Chilled Avocado Soup

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3 tablespoons olive oil

1 cup diced white onion

1 serrano chile, stemmed, seeded, and diced

3 garlic cloves, minced

Salt, for seasoning, plus 1 teaspoon

4 firm ripe avocados, halved, pitted, peeled and mashed

4 cups chicken broth

1/4 cup fresh lemon juice

1/4 cup chopped fresh cilantro leaves

2 cups water

1 teaspoon freshly ground black pepper

1/2 cup Mexican sour cream or creme fraiche, whisked to soften*

Crostini or croutons, for serving, optional