Gingerbread and White Chocolate Mousse Trifle

Name: Gingerbread and White Chocolate Mousse Trifle
Cook time: 3 h
Total time: 3 h
Cuisine: American
Ingredients: Nonstick baking spray; 1 1/4 cups all-purpose flour; 1 1/2 teaspoons ground ginger; 1 teaspoon baking soda; 1/2 teaspoon kosher salt; 1/4 teaspoon ground cloves; 1/4 teaspoon freshly grated nutmeg; 1/2 cup unsulfured molasses; 1/2 cup sugar; 1 stick unsalted butter, melted; 1 large egg; 1 1/2 teaspoons finely grated ginger; 1 tablespoon minced crystallized ginger; 1/2 cup water; 2 teaspoons unflavored powdered gelatin; 4 large egg yolks; 1/4 cup sugar; 3 cups heavy cream; 1/2 cup whole milk; 2 teaspoons finely grated lemon zest; 10 1/2 ounces white chocolate, chopped; 3/4 cup sugar; 1/2 cup pomegranate juice; 1/2 teaspoon fresh lemon juice; 1/2 cup fresh pomegranate seeds; Slivered crystallized ginger, for garnish