5 medium zucchini
2 tablespoons butter
3 shallots (finely minced)
2 cloves garlic (minced)
4 ounces mushrooms (finely minced)
2 tablespoons white wine
1 cup fresh or frozen corn kernels
3/4 cup grated sharp Cheddar cheese
1/2 cup ricotta cheese
1 tablespoon minced fresh tarragon
  Salt and freshly ground pepper (to taste)
1/2 cup freshly grated Parmesan cheese