Tomato and Herb Gratin

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

A simple yet elegant gratin with layered tomatoes and herbs, baked until golden and bubbly for a perfect side dish. This french-inspired vegetarian ready in about 55 minutes pairs heirloom tomatoes, fresh thyme, fresh rosemary for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 120 calories and feeds 6, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

★ 4.6 (10 ratings) Prep: 20 min Cook: 35 min Serves 6 French cuisine 120 cal/serving
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Ingredients

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Instructions

  1. Step 1: Preheat oven to 375°F (190°C). Arrange 3 cups sliced heirloom tomatoes in a single layer in a 9-inch baking dish, then scatter 1 tbsp fresh thyme leaves, 1 tsp chopped rosemary, and 2 minced garlic cloves over the top.
  2. Step 2: Melt 2 tbsp butter in a small saucepan over medium heat, then stir in 1/4 tsp paprika, 1/4 tsp salt, and 1/4 tsp black pepper until fragrant and smooth.
  3. Step 3: Pour butter mixture evenly over tomatoes, cover with foil, and bake for 25 minutes until tomatoes are tender, then remove foil and bake for 10 more minutes until golden and bubbly around the edges.

Frequently asked questions

How long does Tomato and Herb Gratin take to make?

Total time is about 55 minutes (20 min prep + 35 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Tomato and Herb Gratin?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep heirloom tomatoes from drying out.

Can I substitute ingredients in Tomato and Herb Gratin?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Tomato and Herb Gratin for a different number of people?

The recipe is written for 6 servings. Multiply each ingredient by (your serving target / 6). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

Is Tomato and Herb Gratin vegetarian?

Yes — this recipe is tagged vegetarian based on its ingredient list. Always cross-check labels for packaged ingredients (sauces, broths, condiments) since formulations vary by brand.

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