Roasted Istrian Fennel and Potato Gratin
A comforting baked gratin combining tender Istrian fennel and golden potatoes topped with melted cheese and fresh herbs. This Mediterranean-inspired vegetarian recipe, ready in about 70 minutes, pairs fennel bulbs, thinly sliced, heavy cream, whole milk for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 320 calories and feeds 4, 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.
Ingredients
- 2 medium (about 12 oz) fennel bulbs, thinly sliced
- 3 medium (about 15 oz) Yukon gold potatoes, peeled and thinly sliced
- 1 cup heavy cream
- 1/2 cup whole milk
- 1 cup grated Gruyère cheese
- 2 cloves minced garlic
- 1 tbsp fresh thyme leaves
- 1 tsp sea salt
- 1/2 tsp freshly ground black pepper
- 2 tbsp unsalted butter, for greasing
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Equipment for this recipe
Top-rated tools to make this recipe successfully.
Instructions
- Step 1: Preheat the oven to 375°F. Grease a 9x9 inch baking dish with 2 tbsp unsalted butter.
- Step 2: In a large bowl, combine 2 thinly sliced fennel bulbs (about 12 oz) and 3 thinly sliced Yukon gold potatoes (about 15 oz). Add 2 minced garlic cloves, 1 tsp sea salt, 1/2 tsp freshly ground black pepper, and 1 tbsp fresh thyme leaves, tossing gently to mix.
- Step 3: Pour 1 cup heavy cream and 1/2 cup whole milk over the vegetables and stir to evenly coat.
- Step 4: Transfer the mixture to the prepared baking dish, spreading evenly. Sprinkle 1 cup grated Gruyère cheese on top.
- Step 5: Cover the dish with foil and bake for 40 minutes until the potatoes and fennel are tender.
- Step 6: Remove the foil and bake for an additional 15 minutes until the cheese is golden and bubbling.
- Step 7: Let the gratin cool for 5 minutes before serving warm as a side dish or light vegetarian main.
Frequently asked questions
How long does Roasted Istrian Fennel and Potato Gratin take to make?
Total time is about 70 minutes (15 min prep + 55 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 Roasted Istrian Fennel and Potato 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 fennel bulbs, thinly sliced from drying out.
Can I substitute ingredients in Roasted Istrian Fennel and Potato 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 Roasted Istrian Fennel and Potato Gratin for a different number of people?
The recipe is written for 4 servings. Multiply each ingredient by (your serving target / 4). 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 Roasted Istrian Fennel and Potato 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.
