Provençal Vegetable Casserole (Tian) Recipe

Ingredients

• 4 tablespoons olive oil, divided
• 2 large onions, thinly sliced
• 4 cloves garlic, peeled and sliced
• 2 red pepper, cored, seeded and sliced thinly
• 1 teaspoon thyme, picked and chopped
• 1/2 stem rosemary, picked and chopped
• salt and cayenne pepper, to taste
• 1 large green zucchini, sliced into 1/4-inch rounds
• 1 large yellow zucchini, sliced into 1/4-inch rounds
• 1 medium Japanese eggplant, sliced into 1/4-inch rounds
• 4-5 Roma tomatoes, sliced into 1/4-inch rounds
• 2 stems basil, washed and picked