Instructions: Trim off mushroom stems flush with caps. Rinse caps well; place gill-side up in a lightly oiled 10- by 15-inch pan.

In a bowl, mix shrimp, green onions, mayonnaise, and cheese. Spoon shrimp mixture equally into mushroom caps.

Bake in a 400 degree oven until cheese is melted and mushrooms are flexible when pressed, about 12 minutes.

Meanwhile, in a 3- to 4-quart pan, combine broth, polenta, and tomatoes. Stir over high heat until boiling, then reduce heat to low. Stir often until polenta is very smooth to taste, about 3 minutes.

Spoon polenta equally into wide bowls. Set a stuffed mushroom on each portion. Add salt to taste.

This recipe yields 4 servings.

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