Mediterranean Layered Beet, Sweet Potato & Feta Gratin with Walnuts

This Mediterranean-inspired gratin is a beautiful, comforting, and flavorful vegetable dish made with layers of tender roasted beetroot, naturally sweet sweet potatoes, creamy feta cheese, crunchy walnuts, fresh herbs, and a delicious garlic cream sauce. Every layer is packed with rich flavors, making it perfect for family dinners, holiday gatherings, or a special vegetarian meal.

Prep Time: 25 minutes
Cook Time: 50–60 minutes
Total Time: 1 hour 25 minutes
Servings: 6
Cuisine: Mediterranean-Inspired
Course: Side Dish / Vegetarian Main Course

Ingredients

For the Vegetables

• 3 medium fresh beetroots, peeled and thinly sliced

• 2 large sweet potatoes, peeled and thinly sliced

• 1 small red onion, thinly sliced

• 2 tablespoons olive oil

• ½ teaspoon salt

• ½ teaspoon black pepper

• ½ teaspoon dried thyme

• ½ teaspoon dried oregano

For the Creamy Garlic Sauce

• ¾ cup heavy cream

• 2 garlic cloves, minced

• ¼ cup vegetable broth

• ½ teaspoon Dijon mustard

• ¼ teaspoon ground nutmeg

• ½ teaspoon salt

• ¼ teaspoon black pepper

For the Cheese and Walnut Topping

• ¾ cup crumbled feta cheese

• ½ cup chopped walnuts

• ¼ cup grated Parmesan cheese

• 2 tablespoons fresh parsley, chopped

• 1 tablespoon fresh rosemary, finely chopped

• 1 tablespoon extra virgin olive oil

Optional Additions

• ¼ cup sun-dried tomatoes, chopped

• 1 tablespoon lemon zest

• ½ teaspoon chili flakes

• 2 tablespoons toasted pumpkin seeds

Instructions

Step 1: Prepare the Oven and Baking Dish

1. Preheat your oven to 375°F (190°C).

2. Lightly grease a medium-sized baking dish with olive oil or butter.

3. Set the dish aside.

4. Prepare a cutting board and a sharp knife for slicing the vegetables.

Step 2: Prepare the Beetroot

1. Wash the beetroots thoroughly.

2. Peel away the outer skin using a vegetable peeler.

3. Cut the beetroot into thin, even slices, approximately ⅛ inch thick.

4. Place the slices in a large bowl.

5. Add a little olive oil, salt, black pepper, and dried thyme.

6. Toss gently until evenly coated.

Step 3: Prepare the Sweet Potatoes

1. Wash and peel the sweet potatoes.

2. Slice them into thin rounds of approximately the same thickness as the beetroot.

3. Place the slices in a separate bowl.

4. Add olive oil, dried oregano, salt, and black pepper.

5. Toss until the slices are evenly seasoned.

Step 4: Prepare the Creamy Garlic Sauce

1. Place a small saucepan over medium-low heat.

2. Add the heavy cream and vegetable broth.

3. Stir in the minced garlic.

4. Add Dijon mustard, nutmeg, salt, and black pepper.

5. Whisk gently until the ingredients are combined.

6. Heat for approximately 3–4 minutes until warm.

7. Do not allow the sauce to boil.

8. Remove from the heat and set aside.

Step 5: Prepare the Walnuts and Cheese

1. Roughly chop the walnuts into small pieces.

2. If desired, toast them in a dry skillet over medium heat for 2–3 minutes.

3. Allow them to cool.

4. Crumble the feta cheese into a bowl.

5. Grate the Parmesan cheese.

6. Chop the fresh parsley and rosemary.

Step 6: Arrange the First Vegetable Layer

1. Arrange a layer of sweet potato slices across the bottom of the prepared baking dish.

2. Slightly overlap the slices to create an even layer.

3. Add a layer of beetroot slices on top.

4. Scatter a small amount of sliced red onion over the vegetables.

5. Sprinkle a little feta cheese over the layer.

Step 7: Continue Layering

1. Add another layer of sweet potato slices.

2. Follow with another layer of beetroot.

3. Sprinkle some chopped walnuts and feta cheese between the layers.

4. Add the remaining red onion.

5. Continue alternating the vegetables until all the slices are used.

6. Arrange the final layer neatly across the top.

Step 8: Add the Creamy Sauce

1. Slowly pour the prepared garlic cream sauce over the layered vegetables.

2. Spread it evenly using the back of a spoon.

3. Gently press the vegetables down so the sauce reaches between the layers.

4. Sprinkle grated Parmesan cheese over the top.

5. Add the remaining feta cheese and a little chopped rosemary.

Step 9: Bake the Gratin

1. Cover the baking dish loosely with aluminum foil.

2. Place it in the preheated oven.

3. Bake for approximately 35–40 minutes.

4. Carefully remove the foil.

5. Continue baking for another 15–20 minutes.

6. Check the center with a sharp knife. The beetroot and sweet potatoes should be tender.

7. The top should become golden, lightly crisp, and beautifully caramelized.

Step 10: Add the Walnut Topping

1. Remove the gratin from the oven.

2. Sprinkle the remaining toasted walnuts over the top.

3. Add fresh parsley and a little lemon zest.

4. Drizzle with extra virgin olive oil.

5. Allow the gratin to rest for 10–15 minutes before serving so the layers can settle.

Step 11: Serve

1. Carefully cut the gratin into individual portions.

2. Lift each portion using a wide spatula.

3. Transfer to serving plates while warm.

4. Garnish with additional crumbled feta and fresh herbs if desired.

Serve warm and enjoy the delicious combination of sweet vegetables, creamy feta, garlic sauce, and crunchy walnuts.

Helpful Tips

• Even vegetable slices: Use a mandoline slicer to create evenly sized beetroot and sweet potato rounds.

• Prevent excess moisture: Pat the sliced vegetables dry before seasoning.

• For extra creaminess: Add a little more heavy cream or Parmesan.

• For extra crunch: Toast the walnuts before adding them.

• For Mediterranean flavor: Add sun-dried tomatoes, oregano, and fresh rosemary.

• For a lighter version: Replace heavy cream with half-and-half.

• For a vegetarian option: Make sure the Parmesan and feta use vegetarian-friendly cheese ingredients.

• For beautiful layers: Alternate beetroot and sweet potato slices instead of mixing everything together.

Storage Instructions

• Refrigerator: Store leftovers in an airtight container for up to 3–4 days.

• Freezer: Freeze individual portions for up to 2 months. The texture may soften after thawing.

• Reheating: Warm in the oven at 325°F (165°C) for 15–20 minutes.

• Meal Prep: Slice the vegetables and prepare the sauce a day ahead. Assemble and bake when ready.

Frequently Asked Questions (Q&A)

Q1: Can I use pre-cooked beetroot for this recipe?

Yes, you can use pre-cooked beetroot. Slice it evenly and reduce the initial baking time slightly, since the beetroot is already tender.

Q2: Can I make this gratin without heavy cream?

Absolutely! You can use half-and-half, evaporated milk, or an unsweetened plant-based cooking cream. The final texture may be slightly different.

Q3: Can I replace walnuts with another nut?

Yes! Pecans, almonds, pistachios, or hazelnuts are excellent alternatives.

Q4: Can I prepare this gratin ahead of time?

Yes. You can assemble the layers and prepare the sauce a day ahead. Cover and refrigerate. Bake when ready, allowing extra cooking time if starting directly from the refrigerator.

Q5: What cheese works best besides feta?

Goat cheese, ricotta, mozzarella, or Gruyère can work beautifully. Feta gives the dish its characteristic salty Mediterranean flavor.

Q6: How do I know when the vegetables are fully cooked?

Insert a sharp knife into the center. It should slide easily through the beetroot and sweet potato layers.

Q7: Can I make this recipe vegan?

Yes! Use plant-based cream, dairy-free feta, and vegan Parmesan. Replace honey-based additions, if any, with maple syrup.

Q8: What can I serve with Mediterranean Beet and Sweet Potato Gratin?

It pairs wonderfully with grilled chicken, roasted salmon, baked fish, quinoa, couscous, or a fresh green salad.

Q9: Why is my gratin watery?

Beetroot and sweet potatoes naturally release moisture. Pat the vegetables dry before assembling and avoid adding too much broth or cream.

Q10: Can I add other vegetables?

Yes! Thinly sliced zucchini, carrots, or eggplant can be added between the layers. Keep the slices thin so everything cooks evenly.

Q11: Can I make this recipe without walnuts?

Of course! Simply leave them out or replace them with pumpkin seeds or sunflower seeds for a crunchy topping.

Q12: How long should the gratin rest before serving?

Allow it to rest for 10–15 minutes after baking. This helps the creamy sauce settle and makes serving easier.

Nutrition Information

Approximate per serving, based on 6 servings.

• Calories: 360 kcal

• Protein: 10 g

• Carbohydrates: 32 g

• Fat: 23 g

• Fiber: 6 g

• Sugar: 10 g

• Sodium: 520 mg

Enjoy your Mediterranean Layered Beet, Sweet Potato & Feta Gratin with Walnuts! This beautiful, oven-baked dish combines tender vegetables, creamy garlic sauce, salty feta, fragrant herbs, and crunchy walnuts for an irresistible Mediterranean-inspired meal. ❤️