2. Spray a large baking sheet with oil. Add the onions and garlic. Spray with oil again and bake for 10 minutes in the oven, stirring twice.
3. Add all the other ingredients. Mix well and cover with aluminum foil. Seal the foil tightly around the baking sheet. Bake for about 1 hour and 30 minutes, stirring occasionally. Let cool slightly before serving.
Notes & Suggestions
This ratatouille can be stored in the refrigerator for 4 to 5 days and can easily be frozen.