When you want a comforting side dish that feels elegant but is simple to make, Leek Gratin is the perfect choice. Tender leeks bake in a creamy sauce, topped with melty cheese and a crisp golden crust that’s impossible to resist. It’s rich, savory, and pairs beautifully with everything from roast chicken to steak, fish, or a holiday spread.
Unlike bland vegetable casseroles, this gratin highlights the sweet, delicate flavor of leeks and transforms them into a dish that tastes restaurant-worthy with minimal effort.
Ingredients
Serves 6
For the Leeks
- 4 large leeks (or 6 medium), white and light-green parts only
- 1 tablespoon olive oil (or butter)
- 1/2 teaspoon salt
- 1/4 teaspoon black pepper
For the Cream Sauce
- 2 tablespoons butter
- 2 tablespoons all-purpose flour
- 1 1/2 cups (360ml) whole milk (or half-and-half)
- 1/2 cup (120ml) heavy cream (optional for extra richness)
- 1 teaspoon Dijon mustard (optional, but adds depth)
- 1/2 teaspoon garlic powder (or 1 clove garlic, minced)
- 1/2 teaspoon salt (adjust to taste)
- 1/4 teaspoon black pepper
- Pinch of nutmeg (optional)
For the Topping
- 1 cup (100g) shredded Gruyère (or Swiss)
- 1/2 cup (50g) shredded Parmesan
- 1/2 cup (50g) breadcrumbs (panko recommended)
- 1 tablespoon melted butter (for crisp topping)
Preparation Time
- Prep time: 20 minutes
- Cooking time: 30–35 minutes
- Total time: About 55 minutes
Step-by-Step Instructions
Step 1: Preheat and Prep
Preheat oven to 375°F (190°C). Lightly grease a baking dish (about 9×9-inch or similar).
Step 2: Clean and Soften the Leeks
Slice leeks lengthwise and rinse thoroughly (leeks trap dirt between layers).
Cut into 2–3 inch pieces.
Bring a pot of salted water to a boil and blanch leeks for 5–7 minutes until tender. Drain well and gently pat dry.
Step 3: Make the Cream Sauce
In a saucepan over medium heat, melt butter. Whisk in flour and cook for 1 minute.
Slowly whisk in milk (and cream if using) until smooth. Simmer 3–4 minutes until thickened.
Stir in Dijon mustard, garlic, salt, pepper, and nutmeg (if using). Remove from heat.
Step 4: Assemble the Gratin
Arrange leeks in the baking dish. Pour cream sauce evenly over the top.
Step 5: Add the Topping
Mix Gruyère, Parmesan, breadcrumbs, and melted butter. Sprinkle evenly over the leeks.
Step 6: Bake
Bake for 25–30 minutes, until bubbly and golden brown on top.
If you want extra browning, broil for 1–2 minutes at the end (watch closely).
Step 7: Rest and Serve
Let rest 5 minutes before serving. This helps the sauce settle and makes it easier to scoop.
Serving Suggestions
- Serve alongside roast chicken, steak, pork chops, or baked salmon.
- Pair with mashed potatoes and a green salad for a comforting meal.
- Add to holiday tables as an alternative to green bean casserole.
- Spoon over toasted bread for a rich vegetarian appetizer.
- Serve with a crisp side like roasted broccoli or lemony asparagus.
Nutritional Highlights
| Nutrient | Per Serving (1/6 recipe) |
|---|---|
| Calories | 290 |
| Protein | 10 grams |
| Total Fat | 20 grams |
| Saturated Fat | 12 grams |
| Carbohydrates | 18 grams |
| Sugars | 6 grams |
| Fiber | 2 grams |
| Sodium | 520 milligrams |
Nutritional Notes:
- Leeks provide fiber and beneficial plant compounds while staying naturally mild and sweet.
- Dairy and cheese add protein and calcium, making this a satisfying side.
- Using half milk (instead of heavy cream) keeps it lighter without losing creaminess.
Tips for Perfect Leek Gratin
- Wash leeks thoroughly—grit hides inside the layers.
- Drain leeks well after blanching to avoid a watery gratin.
- Gruyère melts beautifully, but Swiss or fontina also work.
- Panko breadcrumbs give the crispiest topping.
- Let it rest a few minutes so the sauce thickens before serving.
Variations to Try
- Bacon Leek Gratin: Add cooked crumbled bacon between the leek layers.
- Mushroom Leek Gratin: Sauté sliced mushrooms and layer them in.
- Lighter Version: Use all milk and reduce cheese slightly.
- Herby Twist: Add thyme, chives, or tarragon to the cream sauce.
- Gluten-Free: Use gluten-free flour and gluten-free breadcrumbs.
This Leek Gratin is a cozy, creamy side dish that turns a simple vegetable into something special. With tender leeks, a velvety sauce, and a golden cheesy topping, it’s the kind of recipe that feels both comforting and elegant.
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