Place green beans in a steamer basket over boiling
water. Cover saucepan and steam green beans 8 to 10 minutes or until
tender. Transfer to a large serving bowl and keep warm. Heat oil in
a heavy nonstick skillet over medium heat. Sauté mushrooms
8 to 10 minutes or until browned. Transfer mushrooms to green beans.
Stir in mustard, lemon juice, and salt and pepper to taste.
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