Ravioli with parmesan

4 small zucchini , sliced into 1/4-inch rounds 2 tablespoons olive oil 1 teaspoon dried red chili pepper flakes 2/3 cup parmesan cheese , freshly grated 1/4[...]

1 (14 1/2 ounce) can Italian-style stewed tomatoes , undrained 1 (14 ounce) can vegetable broth 2 medium zucchini , halved lengthwise and sliced 1/2 inch[...]