Wood Sorrel Savory Onion Tart

Ingredients

• 2 tablespoons butter
• 2 shallots , thinly sliced
• 1 large onion , thinly sliced
• 3 cloves garlic , minced
• 1 teaspoon salt
• 0.25 cups dry white wine
• 3 tablespoons all-purpose flour
• 1 cup fresh wood sorrel leaves , flowers and pods only
• 4 eggs
• 2 cups heavy cream
• 2 teaspoons ground black pepper
• 1 cup grated Gruyere cheese
• 0.5 cups grated Parmesan cheese
• 1 , 9 inch

Instructions

1. 1

   Preheat the oven to 350 degrees F (175 degrees C).

2. 2

   Heat butter over medium-low heat in a skillet. Cook and stir shallots and onion in butter until softened and translucent, about 5 minutes. Add garlic; cook and stir 1 to 2 minutes. Season with salt.

3. 3

   Increase heat to medium. Pour white wine into the skillet and cook until evaporated. Stir in flour. Add sorrel and stir constantly for 1 minute. Remove from heat and let cool.

4. 4

   While sorrel mixture is cooling, whisk together eggs, heavy cream, and black pepper in a large bowl.

5. 5

   Combine sorrel mixture with egg mixture, 1/2 Gruyere cheese, and 1/2 Parmesan cheese. Pour mixture into the prepared pie crust. Top with remaining 1/2 Gruyere cheese and 1/2 Parmesan cheese.

6. 6

   Bake in the preheated oven until a knife inserted into the center comes out clean and tart is firm, about 1 hour.