Ingredients
Equipment
Method
- Prep the vegetables: Wash and trim the zucchini, summer squash, eggplant, and Roma tomatoes. Using a mandoline slicer or sharp knife, cut all vegetables into 1/16-inch thick rounds. Keep vegetables separate and set aside.
- Make the sauce: Preheat oven to 375°F. Heat 2 tablespoons olive oil in a 10-12 inch cast iron skillet over medium heat. Add diced onion and bell pepper, cook for 5 minutes until softened.
- Add aromatics: Stir in minced garlic and thyme, cook for 1 minute until fragrant. Add tomato puree and simmer for 10 minutes until slightly thickened.
- Season the sauce: Stir in red wine vinegar, salt, and pepper. Spread the sauce evenly in the skillet to create a smooth base.
- Arrange the vegetables: Starting from the outer edge of the skillet, arrange vegetable slices in concentric circles. Alternate between zucchini, summer squash, eggplant, and tomato, overlapping each slice so only a small portion is visible.
- Continue the pattern: Work your way toward the center, maintaining the alternating pattern. Take your time to create beautiful, even spirals.
- Season and bake: Drizzle the arranged vegetables with remaining 1 tablespoon olive oil and season with salt and pepper. Cover tightly with aluminum foil.
- Bake until tender: Bake for 45-50 minutes until vegetables are tender but still hold their shape. They should not be browned around the edges.
- Rest and serve: Remove foil and let ratatouille rest for 5 minutes. Garnish with fresh basil and serve directly from the skillet.
Notes
Make-ahead tips: Vegetables can be sliced up to 1 day ahead and stored in airtight containers. The entire dish can be assembled and refrigerated overnight before baking.
Storage: Leftover ratatouille keeps in the refrigerator for up to 3 days. Reheat gently in the oven or enjoy cold.
Substitutions: Golden zucchini can replace yellow squash. Sherry or balsamic vinegar work instead of red wine vinegar. Canned tomato sauce can substitute for tomato puree.
Serving suggestions: Pairs beautifully with grilled salmon, chicken, steak, or serve over pasta for a vegetarian meal.