12 large squash blossoms
1 1/2 cups ricotta cheese
1/2 cup grated parmesan cheese
1/2 cup shredded mozzarella (optional)
1/4 onion, finely minced
2 tablespoons chopped fresh basil
2 tablespoons chopped fresh parsley
2 tablespoons melted butter
Salt and freshly ground black pepper, to taste