Brown Butter
2 cups plus 2 tablespoons unsalted butter

Topping
1 1/4 cups all purpose flour
1 cup packed dark brown sugar
1/4 teaspoon kosher salt
1/2 cup chopped crystallized ginger

Cake
Unsalted butter, for greasing the pan
2 cups all purpose flour
3/4 cup whole wheat flour
1 tablespoon baking powder
1 teaspoon kosher salt
1 teaspoon ground cinnamon
1 teaspoon ground ginger
3/4 teaspoon baking soda
1/2 teaspoon ground allspice
1 3/4 cups sugar
4 large eggs
1 1/2 cups sour cream
1/2 cup whole milk
1 tablespoon vanilla extract
3/4 cups raw almonds, coarsely chopped