Chef Skinner Ratatouille: A Colorful Vegetable Bake

Chef Skinner’s ratatouille is a layered, oven-baked take on the Provençal vegetable stew featured in the animated film Ratatouille. Thin slices of zucchini, yellow squash, eggplant, and tomato sit over a simple pepper-and-tomato sauce, then bake until tender and lightly browned; the careful layering makes it especially appealing to serve.

Ingredients

1 medium yellow onion, finely diced, about 1 cup (150 g)
1 small red bell pepper, finely diced, about 1 cup (150 g)
1 small yellow bell pepper, finely diced, about 1 cup (150 g)
2 tablespoons (30 ml) olive oil, divided
2 garlic cloves, minced, about 2 teaspoons (6 g)
1 can crushed tomatoes, 14.5 ounces (411 g)
1 tablespoon (15 g) tomato paste
1 teaspoon (1 g) fresh thyme leaves, or ½ teaspoon (0.5 g) dried thyme
½ teaspoon (1 g) fine salt, plus more to taste
¼ teaspoon (0.5 g) ground black pepper, plus more to taste
1 medium eggplant, about 8 ounces (225 g)
2 medium zucchini, about 12 ounces (340 g) total
2 medium yellow squash, about 12 ounces (340 g) total
4 medium firm tomatoes, about 1½ pounds (680 g)
1 tablespoon (15 ml) olive oil, for brushing the vegetables
1 teaspoon (1 g) fresh thyme leaves, for topping
1 tablespoon (15 g) chopped fresh parsley, optional

Instructions

Prepare the oven and sauce. Heat the oven to 375°F (190°C). Warm 1 tablespoon (15 ml) olive oil in a skillet over medium heat. Add the onion and bell peppers with a pinch of salt. Cook for 8–10 minutes, stirring now and then, until softened but not browned. Add the garlic and cook for 30 seconds.
Stir in the crushed tomatoes, tomato paste, 1 teaspoon thyme, ½ teaspoon salt, and ¼ teaspoon pepper. Bring the sauce to a gentle simmer, then cook uncovered for 8 minutes, stirring occasionally. Taste and adjust the seasoning. Spread the sauce evenly in a 9-by-13-inch (23-by-33-cm) baking dish.
Slice the vegetables. Trim the eggplant, zucchini, yellow squash, and tomatoes. Cut them into rounds about ⅛ inch (3 mm) thick. A mandoline makes even slices, but a sharp knife works well; use a hand guard and keep fingers clear if using a mandoline. If the vegetables vary greatly in diameter, halve larger rounds so they fit neatly in the dish.
Layer the slices. Arrange the vegetables in alternating, overlapping rows on top of the sauce, standing them slightly upright. For a classic look, repeat zucchini, eggplant, tomato, and yellow squash. Pack the rows close enough to support one another, but do not press them down so tightly that the sauce cannot bubble between them.
Drizzle the vegetables with the remaining 1 tablespoon (15 ml) olive oil. Sprinkle with the remaining 1 teaspoon thyme and a little salt and pepper. Cover the dish tightly with parchment paper or foil, taking care that it does not touch the vegetables.
Bake until tender. Bake covered for 35 minutes. Remove the cover and bake for another 25–30 minutes, until the vegetables are soft when pierced with a small knife, the sauce is bubbling, and the tops have lightly browned. If the vegetables are tender but the tops need more color, broil briefly, watching constantly to prevent scorching.
Let the ratatouille rest for 10 minutes so the bubbling settles and it is easier to serve. Sprinkle with parsley, if using, and spoon portions onto plates with some of the sauce.

Tips

Slice evenly. Aim for similar thickness, since very thin pieces can collapse while thicker ones may remain firm. The vegetables shrink during baking, so keep the rows gently overlapping.
Choose firm produce. Firm, ripe tomatoes hold their shape better than very soft ones. If your eggplant is unusually large or seedy, peel it in alternating strips for a tender bite without removing all its color.
Keep the sauce modest. The vegetables release moisture as they cook. Use the stated amount of tomato and avoid adding extra water, or the finished dish may be soupy.
Make neat slices safely. A mandoline speeds up prep, but its blade is sharp. Use the guard; switch to a knife when pieces become too small to hold securely.

Serving Suggestions

Serve ratatouille warm as a vegetable main with crusty bread, couscous, polenta, or rice to catch the tomato sauce. It also works as a side dish alongside roast chicken, grilled fish, or beans. For a simple finishing touch, add chopped parsley or a few fresh thyme leaves just before serving. The dish can be served warm or at room temperature, but refrigerate it promptly after the meal rather than leaving it out for an extended period.

Variations

This is a home-style, layered interpretation rather than a claim to be the only traditional ratatouille. In Provence, ratatouille is commonly made as a simmered vegetable stew, and methods vary from cook to cook. For a more rustic version, chop the vegetables into bite-size pieces and cook them in a covered pot with the sauce until tender, stirring occasionally. The result is less neatly layered and more stew-like.

For a quicker preparation, use only zucchini, eggplant, and tomatoes; replace the yellow squash with an equal amount of either vegetable. Green bell pepper can replace one of the colored peppers, though it gives the sauce a sharper, slightly more bitter flavor. Dried thyme works in place of fresh as listed, and a small pinch of dried oregano is another suitable herb addition. To make the dish more substantial, serve it with cooked white beans or chickpeas; add them to the sauce before arranging the vegetables.

Storage and Reheating

Refrigerate leftovers within 2 hours of cooking, in a covered container or tightly covered baking dish. Ratatouille keeps for 3–4 days in the refrigerator. Reheat individual portions in the microwave until steaming throughout, or warm the covered dish in a 325°F (165°C) oven until hot. USDA FSIS guidance is to reheat leftovers to 165°F (74°C); check the center with a food thermometer. Add a spoonful of water only if the sauce has become very thick. You can freeze portions in airtight, freezer-safe containers for up to 3 months; thaw in the refrigerator and expect the vegetables to be softer after reheating. Do not store cooked ratatouille at room temperature.

Frequently Asked Questions

Can I make ratatouille ahead of time?
Yes. Bake it a day ahead, cool it promptly, and refrigerate it covered. Reheat it in the oven until the center reaches 165°F (74°C), or serve it at room temperature after taking it out shortly before the meal. The flavors often meld as it rests, though the vegetables will soften a little.

Do I need to salt and drain the eggplant first?
Usually not for this recipe. Modern eggplant is generally mild, and thin slices bake in the sauce without needing a separate salting step. If yours tastes bitter or is especially watery, salt the slices lightly for 20 minutes, then pat them dry before layering; account for the extra salt when seasoning the dish.

Can I use a different baking dish?
Yes, provided it holds the sauce and vegetables in a fairly snug layer. A round 10-inch (25-cm) oven-safe dish can work if the slices are arranged in a spiral. A very wide dish spreads the sauce thinly and may dry it out, while a much smaller dish can crowd the vegetables and need extra baking time.

Why is my ratatouille watery?
Vegetables release liquid as they bake, especially if they are overripe or packed into a deep dish. Use firm produce, avoid adding water, and bake uncovered for the full final 25–30 minutes so excess moisture can evaporate. A brief additional uncovered bake can help if the vegetables are already tender but the sauce remains thin.

Can I assemble it in advance?
You can make the sauce up to 2 days ahead and refrigerate it. For the best texture and to avoid vegetables releasing liquid while waiting, slice and arrange the vegetables just before baking. If you assemble the whole dish ahead, cover and refrigerate it promptly, then bake it within 24 hours; it may require a little extra time in the oven when cold.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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