Ratatouille layered vegetables, often called ratatouille en croûte or simply “fancy ratatouille,” is a beautiful French dish where thinly sliced zucchini, eggplant, tomatoes, and bell peppers are arranged in overlapping spirals and baked until tender. This version is both visually stunning and deeply flavorful, as the vegetables meld together with olive oil, garlic, and herbs into a rich, rustic stew-like texture. It works because the slow roasting concentrates the vegetables’ natural sweetness while the layered presentation ensures every bite has a bit of everything.
Ingredients
- 2 medium zucchini (about 12 oz / 340 g total)
- 2 medium yellow squash (about 12 oz / 340 g total)
- 1 medium eggplant (about 12 oz / 340 g)
- 4 medium Roma tomatoes (about 16 oz / 450 g)
- 1 red bell pepper
- 1 yellow bell pepper
- 1 medium onion (about 6 oz / 170 g), thinly sliced
- 3 cloves garlic, minced
- 2 tablespoons (30 ml) olive oil, plus more for brushing
- 1 teaspoon dried thyme (or 1 tablespoon fresh thyme leaves)
- 1 teaspoon dried oregano
- 1/2 teaspoon salt, plus more to taste
- 1/4 teaspoon black pepper
- 2 tablespoons (30 g) tomato paste
- 1/2 cup (120 ml) vegetable or chicken broth
- Fresh basil leaves, for garnish (optional)
Instructions
- Preheat your oven to 375°F (190°C). Lightly grease a 9-inch (23 cm) round baking dish or a 9×13-inch (23×33 cm) rectangular dish with olive oil.
- Using a sharp knife or a mandoline, slice the zucchini, yellow squash, eggplant, and tomatoes into thin rounds, about 1/8-inch (3 mm) thick. Try to keep them uniform so they cook evenly. Set aside.
- Slice the bell peppers into thin strips, about 1/4-inch (6 mm) wide. Set aside separately.
- In a small skillet over medium heat, heat 1 tablespoon of the olive oil. Add the sliced onion and cook, stirring occasionally, until soft and translucent, about 5 minutes. Add the minced garlic and cook for 1 minute more, until fragrant.
- Stir in the tomato paste and cook for 1 minute, then add the broth, thyme, oregano, salt, and pepper. Bring to a simmer and cook for 2 minutes, until slightly thickened. Remove from heat.
- Spread the onion-tomato mixture evenly over the bottom of the prepared baking dish. This creates a flavorful base that helps the vegetables steam and prevents sticking.
- Arrange the sliced vegetables in a tight, overlapping spiral pattern on top of the sauce. Start from the outside edge and work your way in, alternating between zucchini, yellow squash, eggplant, and tomato slices. Tuck the bell pepper strips between the layers as you go, or scatter them over the top.
- Brush the top of the vegetables with the remaining 1 tablespoon of olive oil. Sprinkle lightly with a pinch of salt and pepper.
- Cover the dish with foil and bake for 40 minutes. Then remove the foil and continue baking for 30–35 minutes more, until the vegetables are tender and the edges are lightly browned and caramelized. The liquid should be mostly absorbed, leaving a rich sauce.
- Let the ratatouille rest for 5 minutes before serving. Garnish with fresh basil if desired.
Tips
- Use a mandoline for even slices. If you don’t have one, a very sharp chef’s knife works, but aim for consistent thickness. Uneven slices will cook at different rates, leaving some crunchy and others mushy.
- Salt the eggplant first (optional). If your eggplant is large or seems bitter, sprinkle the slices with salt and let them sit for 15 minutes, then pat dry. This draws out moisture and reduces bitterness. Skip this step if using small, young eggplants.
- Don’t skip the foil. The covered baking time steams the vegetables, ensuring they become tender without drying out. Removing the foil at the end allows the top to brown and the sauce to concentrate.
- Substitute fresh herbs. If you have fresh thyme or oregano, use about 1 tablespoon of each instead of the dried. Add them to the sauce base rather than sprinkling on top, so they infuse the dish.
Serving Suggestions
Serve this layered ratatouille as a main vegetarian dish with crusty bread or over polenta, rice, or quinoa. It also makes a fantastic side dish alongside grilled chicken, fish, or lamb. A sprinkle of crumbled goat cheese or feta on top adds a creamy, tangy contrast.
Variations
- Provençal style: Add a few anchovy fillets or a tablespoon of capers to the sauce base for a salty, umami boost.
- Add potatoes: Thinly sliced potatoes (russet or Yukon gold) can be layered in, but they need to be parboiled for 3–4 minutes first to ensure they cook through.
- Use a skillet: Instead of a baking dish, you can arrange the vegetables in a cast-iron skillet and bake as directed. The presentation is rustic and charming.
- Spice it up: Add a pinch of red pepper flakes or a diced fresh chili to the sauce for a little heat.
Storage and Reheating
Refrigerate leftovers in an airtight container for up to 4 days. To reheat, place in a 350°F (175°C) oven for 10–15 minutes, or microwave individual portions for 1–2 minutes. The texture will soften further, but the flavor improves overnight. You can also freeze the baked ratatouille for up to 3 months; thaw in the refrigerator overnight before reheating.
Frequently Asked Questions
Can I make this ahead of time?
Yes, you can assemble the entire dish (without baking) up to 24 hours in advance. Cover and refrigerate, then bake as directed, adding about 10 minutes to the covered baking time since you’re starting from cold.
Do I need to peel the eggplant?
No, the skin is edible and adds texture and color. If you prefer a softer texture, you can peel it, but it’s not necessary.
Why is my ratatouille watery?
This can happen if the vegetables are sliced too thick or if you didn’t cook the sauce base long enough. Make sure to simmer the tomato paste and broth until thickened, and don’t overcrowd the dish. Also, salting the eggplant and patting it dry helps remove excess moisture.
Can I use a different type of tomato?
Roma tomatoes are ideal because they are meaty and have fewer seeds. If using larger beefsteak tomatoes, slice them thinner and remove some of the seeds to prevent excess liquid.
Is this dish vegan?
Yes, as written it is vegan, as long as you use vegetable broth. The olive oil and vegetables are all plant-based.
Can I grill the vegetables instead of baking?
Yes, you can grill the sliced vegetables on a grill pan or outdoor grill for 2–3 minutes per side, then layer them in the dish with the sauce and bake for 15–20 minutes just to meld the flavors. The texture will be firmer and smokier.
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