Indian Summer Citrus Pudding with Ginger Snaps and Salted Caramel

Name: Indian Summer Citrus Pudding with Ginger Snaps and Salted Caramel
Ingredients: 1 tablespoon unsalted butter; 2/3 cup superfine sugar; 2 eggs, separated; 2/3 cup reduced fat buttermilk; 1/2 tablespoon blood orange zest; 1/2 tablespoon ruby grapefruit zest; 1 tablespoon blood orange juice; 1 tablespoon ruby grapefruit juice; 1/4 cup all-purpose flour; 1/4 teaspoon salt; 16 round ginger snap cookies; pinch of salt; 1/2 stick unsalted butter, room temperature; 2 tablespoons molasses; 1 large egg white; 1/4 cup lightly packed light brown sugar; 2 cups packed light brown sugar; 1/2 stick unsalted butter; A double pinch of Kosher salt; 1/3 cup heavy cream