
Summer Vegetable Gratin is a delightful dish that brings together the vibrant flavors of fresh summer produce. This Low FODMAP recipe is not only colorful and visually appealing but also versatile enough to serve at family gatherings, picnics, or as a healthy side for weeknight dinners. With layers of zucchini, eggplant, and tomatoes topped with melted mozzarella cheese, this gratin is sure to impress even the pickiest eaters!
Why You’ll Love This Summer Vegetable Gratin
This gratin is packed with benefits that make it a standout dish.
- Easy to Prepare – With simple steps and minimal prep time, anyone can create this delicious gratin.
- Flavorful and Fresh – The combination of herbs and fresh vegetables creates a dish bursting with flavor.
- Versatile Side Dish – Pair it with your favorite proteins or enjoy it on its own as a light meal.
- Low FODMAP Friendly – Perfect for those following a low FODMAP diet without sacrificing taste.
- Colorful Presentation – The vibrant colors of the vegetables make it an eye-catching addition to any table.
Tools and Preparation
Having the right tools makes cooking easier and more enjoyable.
Essential Tools and Equipment
- Baking dish (8 x 8-inch | 20 x 20 cm)
- Medium skillet
- Small bowl
- Knife
- Cutting board
Importance of Each Tool
- Baking dish – A sturdy baking dish ensures even cooking and presentation for your gratin.
- Medium skillet – Ideal for sautéing leek leaves, allowing them to soften before layering in the dish.
- Knife – A sharp knife makes cutting vegetables into uniform rounds quick and easy.
Ingredients
A delicious Low FODMAP Summer Vegetable Gratin recipe. The perfect side dish with colourful summer vegetables topped with grated cheese.
Vegetables
- 13.7 oz | 390g zucchini (1 medium, or 1/2 green zucchini and 1/2 yellow zucchini)
- 5.29 oz | 150g eggplant (1 small)
- 8.4 oz | 238g common tomatoes (2 medium)
- 1.9 oz | 50g leek leaves (thinly sliced)
- 2 tbsp olive oil (plus more to drizzle)
- Salt and black pepper to taste
Tomato-Herb Broth
- 2 tbsp | 28g tomato paste (low FODMAP, no onions or garlic added)
- 1/2 cup | 75ml water
- 1 tsp dried oregano
- 1 tsp dried thyme (optional)
- 1 tsp salt
Topping
- 1/2 cup | 80g grated mozzarella cheese
- 1 tbsp fresh basil leaves (thinly chopped)

How to Make Summer Vegetable Gratin
Step 1: Preheat the Oven
Preheat your oven to 400° F | 200ºC so it’s ready when you need it.
Step 2: Sauté the Leek Leaves
Heat olive oil in a medium skillet over medium heat.
1. Add the thinly sliced leek leaves.
2. Cook while stirring until they become tender, which will take about 3 to 5 minutes.
3. Transfer the cooked leeks into an 8 x 8-inch baking dish, spreading them evenly across the bottom.
Step 3: Prepare the Tomato-Herb Broth
In a small bowl, combine:
1. Water,
2. Tomato paste,
3. Dried oregano,
4. Optional dried thyme,
5. Salt.
Mix well until fully combined and set aside.
Step 4: Layer the Vegetables
Wash all your vegetables thoroughly and cut them into uniform rounds of about 1/4-inch | 0.5 cm thickness.
1. Place these vegetable rounds in the baking dish over the leeks.
2. Arrange them in alternating rows until you fill the dish snugly but not overly crammed.
Step 5: Add Broth and Bake Covered
Pour the prepared herb broth over the layered vegetables evenly.
1. Season with salt and black pepper according to taste.
2. Drizzle with additional olive oil if desired.
3. Cover the dish tightly with aluminum foil and bake for approximately 40 minutes until tender.
Step 6: Add Cheese Topping and Bake Uncovered
After baking covered:
1. Remove the foil from the dish.
2. Sprinkle grated mozzarella cheese generously on top.
3. Continue baking uncovered for another 15 minutes until the cheese is melted and golden brown.
Let sit for at least 10 minutes after removing from oven before garnishing with chopped fresh basil leaves and serving warm!
How to Serve Summer Vegetable Gratin
Serving Summer Vegetable Gratin is a delightful way to showcase your culinary skills. This dish pairs well with various accompaniments and can be enjoyed in multiple ways.
As a Side Dish
- Grilled Chicken – The rich flavors of the gratin complement grilled chicken perfectly.
- Roasted Fish – A light, flaky fish like cod or tilapia enhances the freshness of the vegetables.
- Quinoa Salad – This adds a nutritious grain option that balances the meal.
As a Main Course
- Pasta – Serve it alongside a light pasta dish for a hearty vegetarian meal.
- Crusty Bread – A slice of fresh bread can help soak up the delicious broth from the gratin.
- Mixed Greens Salad – A simple salad provides a refreshing contrast to the warm gratin.
For Meal Prep
- Lunch Boxes – Portion out servings for easy grab-and-go lunches during the week.
- Freezer-Friendly Option – The gratin can be frozen and reheated for future meals.
How to Perfect Summer Vegetable Gratin
To make your Summer Vegetable Gratin even more enjoyable, consider these helpful tips.
- Boldly Choose Fresh Ingredients – Using fresh, seasonal vegetables will elevate the flavor profile.
- Boldly Layer Vegetables – Arrange vegetables snugly but not overcrowded for even cooking and better presentation.
- Boldly Experiment with Cheese – Try different cheese varieties, such as feta or gouda, for unique flavor twists.
- Boldly Use Herbs – Fresh herbs can add brightness; try adding thyme or parsley for extra aroma.
- Boldly Adjust Cooking Time – Keep an eye on vegetables; adjust baking time based on your oven’s performance.
- Boldly Let It Rest – Allowing the gratin to sit before serving helps flavors meld and makes slicing easier.

Best Side Dishes for Summer Vegetable Gratin
Pairing side dishes with your Summer Vegetable Gratin can enhance your dining experience. Here are some great options to consider:
- Garlic Bread – Crunchy, buttery bread infused with garlic complements the dish beautifully.
- Steamed Asparagus – Lightly steamed asparagus adds a touch of elegance and color to your plate.
- Roasted Potatoes – Crispy roasted potatoes provide a satisfying texture contrast.
- Couscous Salad – A couscous salad with lemon vinaigrette brings brightness and acidity.
- Caprese Salad – Fresh mozzarella, tomatoes, and basil create a classic pairing that highlights summer flavors.
- Coleslaw – A tangy coleslaw adds crunch and balances the rich flavors of the gratin.
Common Mistakes to Avoid
Cooking a Summer Vegetable Gratin can be delightful, but a few common mistakes can ruin the experience. Here are some pitfalls to avoid:
- Overcrowding the Dish: When placing the vegetables in the baking dish, ensure they fit snugly but aren’t crammed. Overcrowding can lead to uneven cooking and soggy vegetables.
- Neglecting Seasoning: Don’t skip on seasoning! Adding salt and pepper before baking enhances flavors. Taste as you go and adjust to achieve a well-seasoned dish.
- Skipping the Resting Time: After baking, letting the gratin sit for at least 10 minutes is essential. This allows the layers to set, making it easier to serve.
- Ignoring Vegetable Sizes: Cutting vegetables into uneven sizes can affect cooking times. Aim for uniform thickness (about 1/4-inch) for even doneness.
- Using Low-Quality Cheese: The cheese topping is crucial for flavor. Choose a good quality mozzarella or your favorite cheese for best results; it makes a significant difference.
Storage & Reheating Instructions
Refrigerator Storage
- Store leftover gratin in an airtight container.
- It will last up to 3 days in the refrigerator.
- Allow it to cool completely before sealing.
Freezing Instructions
- Freeze portions in freezer-safe containers or bags.
- It can be stored for up to 2 months.
- Label with the date for easy tracking.
Reheating Instructions
- Oven: Preheat to 350°F (175°C). Cover with foil and heat for about 20 minutes or until warmed through.
- Microwave: Use medium power, heating in 30-second intervals until hot. Be cautious of hot spots.
- Stovetop: Heat in a skillet over low heat, stirring occasionally until warmed through.

Frequently Asked Questions
What is Summer Vegetable Gratin?
Summer Vegetable Gratin is a delicious baked dish featuring colorful summer vegetables layered and topped with cheese, perfect as a side dish.
Can I customize my Summer Vegetable Gratin?
Absolutely! Feel free to swap out vegetables based on what you have on hand or prefer, such as bell peppers or squash.
Is Summer Vegetable Gratin gluten-free?
Yes! This recipe does not contain gluten ingredients, making it suitable for gluten-free diets.
How can I make this dish vegetarian-friendly?
The recipe is naturally vegetarian, featuring seasonal veggies and cheese. Enjoy it as is!
How do I store leftover Summer Vegetable Gratin?
Store leftovers in an airtight container in the fridge for up to three days or freeze portions for later use.
Final Thoughts
This Summer Vegetable Gratin showcases vibrant flavors and is versatile enough for any meal. Whether served at a family gathering or as an everyday side dish, it’s easy to customize with your favorite seasonal vegetables. Try this recipe today and enjoy a delightful culinary experience!

Summer Vegetable Gratin
Experience the vibrant flavors of summer with this easy-to-make Summer Vegetable Gratin. This delightful dish combines layers of fresh zucchini, eggplant, and juicy tomatoes, all topped with melted mozzarella cheese for a satisfying finish. Perfect as a colorful side for family gatherings or picnics, this Low FODMAP recipe is versatile enough to shine on any table. Enjoy the deliciousness of seasonal produce while impressing even the pickiest eaters with its eye-catching presentation.
- Total Time: 1 hour 10 minutes
- Yield: Serves approximately six people 1x
Ingredients
- 1 medium zucchini (390g)
- 1 small eggplant (150g)
- 2 medium tomatoes (238g)
- 50g leek leaves, thinly sliced
- 2 tbsp olive oil
- 80g grated mozzarella cheese
- 2 tbsp tomato paste (low FODMAP)
- Dried oregano, dried thyme, salt, and black pepper to taste
Instructions
- Preheat your oven to 400°F (200°C).
- In a skillet, heat olive oil over medium heat. Sauté the sliced leek leaves for about 3–5 minutes until tender.
- In a bowl, mix together water, tomato paste, oregano, thyme (if using), and salt to create the tomato-herb broth.
- Thinly slice zucchini, eggplant, and tomatoes into uniform rounds. Layer these in an 8 x 8-inch baking dish over the sautéed leeks.
- Pour the herb broth evenly over the layered vegetables and season with salt and pepper.
- Cover with aluminum foil and bake for about 40 minutes until tender.
- Remove foil, sprinkle mozzarella cheese on top, and bake uncovered for another 15 minutes or until the cheese is melted and golden brown.
- Let sit for at least 10 minutes before serving.
- Prep Time: 15 minutes
- Cook Time: 55 minutes
- Category: Sides
- Method: Baking
- Cuisine: Vegetarian
Nutrition
- Serving Size: Approximately 1/6 of the gratin (about 150g)
- Calories: 180
- Sugar: 4g
- Sodium: 320mg
- Fat: 11g
- Saturated Fat: 4g
- Unsaturated Fat: 7g
- Trans Fat: 0g
- Carbohydrates: 13g
- Fiber: 3g
- Protein: 6g
- Cholesterol: 15mg
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