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1
Trim off and discard any stems from mushroom caps; gently rinse caps and drain well. Rinse green onions; trim off and discard ends. In a small bowl, mix olive oil and lemon juice.
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2
Brush smooth sides of mushroom caps and the green onions with oil mixture. Lay mushrooms, smooth side down, and green onions on a grill over hot coals or high heat on a gas grill (you can hold your hand at grill level only 2 to 3 seconds); close lid if using a gas barbecue. Turn onions as needed until lightly browned on all sides, 2 to 3 minutes total. With tongs, transfer to a plate. Cook mushrooms without turning until they are limp and begin to release their juices, 3 to 5 minutes. With a wide spatula, transfer, smooth side down, to a 9- by 13-inch baking pan.
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3
Drizzle mushrooms evenly with vinegar and sprinkle with pepper. Add 1/4 cup vegetable stock to pan. Cover and bake in a 300u00b0 regular or convection oven until hot, 5 to 10 minutes.
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4
Meanwhile, in a 1- to 2-quart pan over high heat, bring remaining 1/2 cup stock to a boil. Stir in couscous. Cover and remove from heat. Let stand until liquid is absorbed, about 5 minutes. Fluff couscous with a fork. If it seems too dry, stir in 3 to 5 tablespoons liquid from mushroom caps. Stir in parsley.
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5
Set mushrooms, smooth side down, on plates. Top equally with couscous. Spoon pepper coulis equally around mushrooms and garnish with green onions. Add salt to taste.
