SAUCE:
2 tablespoons butter
2 tablespoons flour
2 cups vegetable stock
1 medium onion, poked with a fork
3 tablespoons Parmesan cheese
Salt and pepper
VEGETABLES:
2 pounds plum tomatoes, seeded, quartered
2 medium Italian eggplant, quartered, sliced
2 large red bell peppers, seeded, quartered
1 large Spanish onion, halved, cut into eighths
4 cloves garlic, chopped
1/4 cup calamata olives, pitted, sliced
2 tablespoons olive oil
1 pound ziti pasta, cooked al dente, drained
1 pound mozzarella cheese, sliced thin
1/2 cup grated Parmesan cheese