Yield: Makes 6 servings (6 cups)
1. In 2-quart heavy saucepan over medium heat, in hot butter, cook onion until tender-crisp, stirring frequently. 2. Add remaining ingredients except fish. Heat to boiling. Reduce heat to low; cover. Simmer 5 minutes, stirring occasionally to separate beans. 3. Add fish; simmer 10 minutes more or until fish flakes easily when tested with a fork.
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