Description
Try a French Onion Mushroom Tart a crowdpleasing easy comfort dish with caramelized onions mushrooms and golden crust click for the full recipe
Ingredients
Scale
1 sheet puff pastry (9 inch / 23 cm)
1–2 tbsp olive oil
3 large yellow onions, thinly sliced
2 cloves garlic, minced
8 oz (225 g) mushrooms (cremini or button), sliced
1–2 tsp fresh thyme leaves
1/4 cup white wine or dry sherry (optional)
1 tsp balsamic vinegar
1/2 cup heavy cream or crème fraîche
2 large eggs
1 cup Gruyere cheese, grated
Salt and pepper, to taste
Optional greens (spinach or arugula), 1 cup
Instructions
- Step 1 — Prep the crust: Thaw puff pastry according to package directions, roll to a 12 inch square, trim to fit a 9 inch tart pan, dock the crust, line with parchment, and blind bake at 400°F (200°C) for 10–12 minutes until edges are set and just color. Remove weights and parchment, and let crust cool slightly.
- Step 2 — Caramelize the onions: In a wide skillet, heat 1 tablespoon olive oil over medium heat. Add sliced onions with salt and a pinch of sugar; cook slowly until deeply golden and jammy, about 20–25 minutes. Halfway through, add minced garlic and thyme.
- Step 3 — Sauté the mushrooms: In another skillet, heat 1 teaspoon olive oil; add mushrooms with a pinch of salt and sauté until browned, about 5–7 minutes. Deglaze with white wine or sherry if using; simmer until reduced.
- Step 4 — Make the filling: In a bowl whisk together the heavy cream (or crème fraîche) and eggs until smooth. Stir in half of the grated Gruyere and the balsamic vinegar. Fold in the caramelized onions and mushrooms, then season with salt, pepper, and additional thyme if desired. If you are adding greens such as spinach, wilt them and chop before folding into the mixture.
- Step 5 — Assemble and bake: Spread the mushroom–onion mixture into the prepared crust, smoothing the top. Sprinkle the remaining Gruyere cheese evenly over the surface. Bake at 375°F (190°C) for 25–30 minutes, or until the filling is set and the cheese is melted and lightly golden. Rest for 10 minutes before slicing to allow the filling to finish setting.
- Step 6 — Serve and savor: Cut into wedges and serve with a fresh herb garnish if you like. A simple green salad with lemon vinaigrette pairs well, and finishing with a drizzle of olive oil or a spoonful of sour cream adds extra richness.
- Prep Time: 45 minutes
- Cook Time: 1 hour 15 minutes
- Category: Vegetarian main course
- Method: Baking
- Cuisine: French
Nutrition
- Calories: 320 calories
- Sugar: 6 grams
- Fat: 20 grams
- Carbohydrates: 28 grams
- Fiber: 2 grams
- Protein: 8 grams
