Quick Recipe Version (TL;DR)
Quick Ingredients
- 3 tbsp extra-virgin olive oil
- 1 medium yellow onion, diced (about 1 1/2 cups)
- 5 garlic cloves, minced
- 1 medium eggplant, cut into 3/4-inch cubes (about 5 cups)
- 2 medium zucchini, cut into 3/4-inch chunks (about 3 cups)
- 1 red bell pepper, cut into 1-inch pieces
- 1 yellow bell pepper, cut into 1-inch pieces
- 1 1/2 tsp kosher salt, divided, plus more to taste
- 1/2 tsp freshly ground black pepper, plus more to taste
- 2 tbsp tomato paste
- 1 (28 oz) can whole peeled tomatoes, hand-crushed with juices
- 1 tsp dried thyme
- 1 bay leaf
- 1 tbsp balsamic vinegar (optional)
- 1/3 cup chopped fresh basil, plus more for serving
- 5 cups water
- 1 1/4 cups polenta (medium-grind cornmeal)
- 2 tbsp unsalted butter
- 1/2 cup finely grated Parmesan cheese (optional)
Do This
- 1) Warm olive oil in a large Dutch oven over medium heat; cook onion 6–8 minutes, then garlic 30 seconds.
- 2) Add eggplant, peppers, zucchini, 1 tsp salt, and pepper; cook 10 minutes, stirring.
- 3) Stir in tomato paste 1 minute; add crushed tomatoes, thyme, bay leaf; simmer covered 30 minutes on low.
- 4) Uncover and simmer 15 minutes more until thick and silky; finish with basil (and balsamic if using). Season to taste.
- 5) Meanwhile, boil 5 cups water; whisk in polenta slowly, add 1/2 tsp salt; simmer 25–30 minutes, stirring often.
- 6) Stir butter (and Parmesan) into polenta; loosen with hot water if needed.
- 7) Spoon polenta into bowls; top with ratatouille and fresh basil.
Why You’ll Love This Recipe
- Peak-summer flavor, minimal fuss: Farm-stand vegetables turn sweet and jammy as they slowly simmer.
- Comforting and vibrant: Creamy polenta balances the bright tomato-herb sauce and tender vegetables.
- Flexible and forgiving: Use what looks best at the market and adjust herbs to taste.
- Great for leftovers: The ratatouille tastes even better the next day.
Grocery List
- Produce: 1 medium yellow onion, 5 garlic cloves, 1 medium eggplant, 2 medium zucchini, 1 red bell pepper, 1 yellow bell pepper, 1 small bunch fresh basil
- Dairy: 2 tbsp unsalted butter, Parmesan cheese (optional)
- Pantry: extra-virgin olive oil, kosher salt, black pepper, tomato paste, 1 (28 oz) can whole peeled tomatoes, dried thyme, bay leaf, polenta (medium-grind), balsamic vinegar (optional)
Full Ingredients
Ratatouille (Slow-Cooked Summer Vegetables)
- Extra-virgin olive oil: 3 tbsp
- Yellow onion: 1 medium, diced (about 1 1/2 cups)
- Garlic: 5 cloves, minced
- Eggplant: 1 medium (about 1 to 1 1/4 lb), cut into 3/4-inch cubes (about 5 cups)
- Zucchini: 2 medium (about 1 lb total), cut into 3/4-inch chunks (about 3 cups)
- Bell peppers: 1 red and 1 yellow, cut into 1-inch pieces
- Kosher salt: 1 1/2 tsp, divided (use 1 tsp during cooking; reserve 1/2 tsp for polenta), plus more to taste
- Freshly ground black pepper: 1/2 tsp, plus more to taste
- Tomato paste: 2 tbsp
- Whole peeled tomatoes: 1 (28 oz) can, hand-crushed with juices
- Dried thyme: 1 tsp
- Bay leaf: 1
- Balsamic vinegar (optional): 1 tbsp (adds gentle sweetness and depth)
- Fresh basil: 1/3 cup chopped, plus more leaves for serving
Creamy Polenta
- Water: 5 cups
- Polenta (medium-grind cornmeal): 1 1/4 cups
- Reserved kosher salt: 1/2 tsp
- Unsalted butter: 2 tbsp
- Finely grated Parmesan (optional): 1/2 cup
To Serve (Optional but Recommended)
- Extra basil leaves: 10–15 small leaves
- Extra-virgin olive oil: 1–2 tsp for drizzling
- Freshly ground black pepper: to taste
Step-by-Step Instructions
Step 1: Prep the vegetables for even cooking
Dice the onion and mince the garlic. Cut the eggplant into 3/4-inch cubes, zucchini into 3/4-inch chunks, and bell peppers into 1-inch pieces. Keeping the pieces similar in size helps everything soften at the same pace and prevents the zucchini from turning to mush before the eggplant is tender.
Step 2: Sweat the onion and bloom the garlic
Set a large Dutch oven or heavy pot over medium heat. Add 3 tbsp olive oil. When the oil shimmers, add the diced onion and cook, stirring occasionally, until softened and lightly golden, 6–8 minutes.
Add the minced garlic and cook just until fragrant, 30 seconds. (Keep it moving so it doesn’t brown.)
Step 3: Start the slow-cook with the sturdier vegetables
Add the eggplant, bell peppers, and zucchini to the pot. Sprinkle with 1 tsp kosher salt and 1/2 tsp black pepper. Stir well to coat the vegetables in the olive oil.
Cook, stirring every minute or two, until the vegetables begin to soften and release moisture, 10 minutes. You’re not looking for browning here; you’re jump-starting tenderness and building a flavorful base.
Step 4: Concentrate the tomato flavor, then add the tomatoes
Stir in the 2 tbsp tomato paste and cook, stirring constantly, until it darkens slightly and coats the vegetables, 1 minute. This step gives the sauce a deeper, sweeter tomato backbone.
Add the 28 oz crushed (hand-crushed) tomatoes with their juices, 1 tsp dried thyme, and 1 bay leaf. Bring to a gentle simmer.
Step 5: Simmer low and slow until silky and jammy
Reduce heat to low, cover, and simmer gently for 30 minutes, stirring every 8–10 minutes to prevent sticking.
Uncover and continue to simmer on low until the ratatouille is thick, glossy, and the eggplant is completely tender, 15 minutes more. If it ever looks dry, add 2–4 tbsp water and stir, then continue simmering.
Step 6: Cook creamy polenta while the ratatouille simmers
About 25–30 minutes before you plan to serve, start the polenta. In a medium saucepan, bring 5 cups water to a boil over high heat.
Reduce to medium-low so the water is at a steady simmer. Slowly whisk in 1 1/4 cups polenta in a thin stream, whisking constantly to prevent lumps. Stir in the 1/2 tsp kosher salt.
Cook at a gentle simmer until thick and creamy, 25–30 minutes, stirring often with a wooden spoon (every minute or so near the end). If it gets too thick before the grains are tender, whisk in 1/4–1/2 cup hot water.
Step 7: Finish with butter, basil, and serve bowl-style
Turn off the heat under the ratatouille. Remove and discard the bay leaf. Stir in 1/3 cup chopped fresh basil. If using, stir in 1 tbsp balsamic vinegar. Taste and adjust with more salt and black pepper as needed.
Turn off the heat under the polenta. Stir in 2 tbsp butter until melted. Stir in 1/2 cup grated Parmesan (if using). Taste and adjust salt if needed.
To serve, spoon polenta into warm bowls and top generously with ratatouille. Finish with extra basil leaves, a small drizzle of olive oil, and black pepper.
Pro Tips
- Go low and slow: Keep the ratatouille at a gentle simmer (small bubbles). Too much heat can scorch the bottom and make the vegetables break down unevenly.
- Hand-crush the tomatoes: Crushing whole peeled tomatoes by hand gives you a mix of smooth sauce and tender tomato pieces, which feels more rustic and less “jarred.”
- Polenta texture control: Polenta thickens as it sits. Keep a kettle of hot water nearby and whisk in a splash to loosen it right before serving.
- Finish with fresh herbs: Add basil at the end so it stays bright and fragrant instead of tasting cooked.
- Better the next day: If you can, make the ratatouille earlier in the day and rewarm gently; the flavors meld beautifully.
Variations
- Oven-roasted ratatouille: Toss the eggplant, zucchini, peppers, and onion with the olive oil, salt, and pepper. Roast at 425°F (220°C) for 30–35 minutes, then simmer with the tomatoes, thyme, and bay leaf for 15 minutes to marry flavors.
- Protein add-on: Serve with a fried or poached egg, or spoon the ratatouille alongside grilled chicken or Italian sausage.
- Vegan and dairy-free: Use olive oil instead of butter in the polenta and skip the Parmesan (or use a vegan alternative). The ratatouille is naturally vegan.
Storage & Make-Ahead
Store ratatouille and polenta separately in airtight containers. Refrigerate for up to 4 days. Reheat ratatouille gently on the stove over medium-low heat, adding a splash of water if needed. Reheat polenta over low heat with 1/4 to 3/4 cup water (added gradually) to restore creaminess. You can make the ratatouille up to 2 days ahead; its flavor improves as it rests. Polenta is best fresh, but it reheats well with extra liquid.
Nutrition (per serving)
Approximate, per 1 of 6 servings (with butter, without Parmesan): 310 calories, 9 g protein, 46 g carbs, 12 g fat, 7 g fiber, 610 mg sodium. (Values vary by vegetable size and brands.)
