Alsace Onion Tart (Tarte à l’Oignon)

Name: Alsace Onion Tart (Tarte à l’Oignon)
Prep time: 1 h
Cook time: 45 min
Total time: 1 h 45 min
Cuisine: French
Ingredients: 2 cups all-purpose flour (plus more for dusting); ¾ teaspoon salt; 12 tablespoons butter (cold; cut into cubes); 5 tablespoons water (cold); 1 teaspoon cider vinegar; 4 slices thick-cut bacon (cut crosswise into strips); 2 pounds onions (halved lengthwise and very thinly sliced crosswise (10 cups)); 1 ¼ teaspoons salt; 1 teaspoon ground black pepper; 1 cup heavy cream; 4 large eggs; 2 egg yolks; ½ teaspoon freshly grated nutmeg; 2 tablespoons Fresh thyme (chopped); ½ cup grated Gruyere cheese

Instructions

Prep:1hCook:45min

If you're looking for a tart that truly embodies richness and luxury, this Alsace Onion Tart, also known as a French Onion Tart, is for you. With a golden, buttery crust and a creamy filling bursting with tender onions, smoky bacon, and aromatic thyme, this dish is pure comfort. Topped with a generous sprinkle of grated Gruyère cheese, this is an indulgent dish. Serve it as a main meal for lunch, dinner, or brunch, or slice it into smaller portions and serve it as an appetizer.

Updated at: Fri, 07 Nov 2025 08:30:24 GMT