Easy Slow Cooker Lentil Ratatouille

Legumes, Lunch

March 21, 2026

There’s nothing quite like coming home to the aroma of a slow-simmered stew, and this vibrant Lentil Ratatouille is the ultimate ‘fix it and forget it’ dream! We’re talking tender eggplant, summer squash, and sweet peppers mingling with hearty lentils in a rich, herby tomato sauce. It’s a rustic, nourishing meal that practically cooks itself, transforming simple garden vegetables into a bowl of pure comfort. Perfect for busy weeknights or a lazy Sunday supper!

Ingredients

• 12 ounces / 340 g eggplant, 1 small, peeled and cubed
• 2 14.5-ounce / 411 g cans diced tomatoes with basil, garlic, and oregano, undrained
• 2.5 cups / 590 ml yellow summer squash or zucchini, halved and cut into 1/2-inch / 1.25 cm pieces
• 2 cups / 475 ml coarsely chopped onions, about 2 large
• 1 cup / 200 g brown or yellow lentils, rinsed and drained
• 3/4 cup / 180 ml chopped red sweet pepper, 1 medium
• 1/2 cup / 120 ml water
• 1/4 to 1/2 teaspoon / 1.25 to 2.5 ml ground black pepper

Instructions

1. In a 3.5- or 4-quart slow cooker, combine the cubed eggplant, undrained tomatoes, squash, onions, rinsed lentils, sweet pepper, water, and black pepper. Stir gently to combine all the .
2. Cover and cook on the LOW setting for 8 to 9 hours or on the HIGH setting for 4 to 4.5 hours, until the vegetables are soft and the lentils are perfectly tender.

Nutritional Information

• Serving Size: 1 of 6
• Calories: 215
• Total Fat: 1 g
• Saturated Fat: 0 g
• Cholesterol: 0 mg
• Sodium: 713 mg
• Carbohydrates: 42 g
• Fiber: 14 g
• Protein: 12 g

Pro Tips

• For a brighter flavor, stir in a splash of balsamic vinegar or a squeeze of fresh lemon juice just before serving.
• Serve this hearty stew over creamy polenta, quinoa, or with a side of crusty bread to soak up the delicious sauce.
• Garnish with fresh chopped basil or parsley for a pop of color and freshness that elevates the entire dish.

FAQ

Q: Is this lentil ratatouille a good source of plant-based protein
A: Yes, it’s an excellent source. The lentils are packed with protein, providing 12 grams per serving. This makes it a complete and satisfying vegetarian meal that will keep you full and energized.

Q: Can I use different lentils or vegetables in this recipe
A: Absolutely! This recipe is very flexible. You can use green or red lentils instead of brown, though red lentils may cook faster and become softer. Feel free to swap the summer squash for zucchini or add other vegetables like mushrooms or different colored bell peppers.

Q: How can I store and reheat this vegetarian stew
A: This stew is perfect for meal prep. Store leftovers in an airtight container in the refrigerator for up to 5 days. The flavors will meld and taste even better the next day. You can also freeze it for up to 3 months. Reheat gently on the stovetop or in the microwave until hot.

Q: What can I serve with this ratatouille to make it a complete meal
A: To make it a fully balanced meal, serve it over a whole grain like quinoa, brown rice, or farro. For extra protein and creaminess, a dollop of vegan yogurt or a sprinkle of nutritional yeast works wonderfully. Crusty whole-wheat bread is also perfect for soaking up the sauce.

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