- 1 Heat 1 Tbs. oil in large pot over medium-high heat. Add onion, and sauté 7 minutes, or until translucent. Stir in all mushrooms. Cook 10 minutes, stirring occasionally. Add garlic, thyme, and lemon zest, and cook 1 minute more. Stir in vinegar, and simmer 1 to 2 minutes, or until liquid has evaporated. Add broth and 2 cups water, and bring to a boil. Reduce heat to medium-low. Simmer, partially covered, 45 minutes. Cool 20 minutes, then purée in blender until smooth.
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