Baked Tomatoes and Zucchini

INGREDIENTS

• 2 Tbs. olive oil
• 1 red onion, sliced
• Salt and freshly ground pepper, to taste
• 3/4 lb. plum tomatoes, sliced
• 2 small zucchini, about 3/4 lb. total, sliced
• 1 Tbs. minced fresh basil
• 1 Tbs. minced fresh marjoram
• 1/4 cup water or chicken broth