INGREDIENTS
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3 tablespoons olive oil
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1 cup diced white onion
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1 serrano chile, stemmed, seeded, and diced
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3 garlic cloves, minced
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Salt, for seasoning, plus 1 teaspoon
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4 firm ripe avocados, halved, pitted, peeled and mashed
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4 cups chicken broth
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1/4 cup fresh lemon juice
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1/4 cup chopped fresh cilantro leaves
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2 cups water
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1 teaspoon freshly ground black pepper
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1/2 cup Mexican sour cream or creme fraiche, whisked to soften*
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Crostini or croutons, for serving, optional