Earl Grey-Lavender and Lemon Tart

Name: Earl Grey-Lavender and Lemon Tart
Cuisine: European, British
Ingredients: 12 tbsp. unsalted butter (room temperature); 1/2 cup sugar; 1/2 teaspoon vanilla extract; 1 3/4 cups all-purpose flour; pinch salt; 2 eggs; 4 egg yolks; 3/4 cup sugar; 1 tablespoon grated lemon zest; 1/2 cup fresh lemon juice ((from 2 to 3 lemons)); 4 tablespoons unsalted butter (softened); 16 ounces Whole milk; 3 tablespoons Rishi Earl Grey Lavender loose tea ((you can substitute 3 earl grey tea bags and 1 tablespoon of lavender buds)); 1 teaspoon vanilla extract; 1 1/2 cups sugar; 1/3 cup corn starch; 2 egg yolks; 16 ounces unsalted butter (completely softened, room temperature); 16 ounces mascarpone cheese (room temperature); 1/2 teaspoon salt; juice of one lemon