Preheat oven to 375 degrees F. Grease a 9-inch springform pan.

In a medium bowl combine the flour, baking powder, baking soda, 1 cup sugar, salt, and ginger. In another bowl combine the lemon zest, lemon juice, milk, 1/2 cup melted butter, and eggs. Add the wet mixture to the dry and fold together, just until the ingredients are combined. Spread the mixture in the prepared springform pan.

For the crumble combine the 1/2 cup sugar, 1/2 cup flour, 1/2 teaspoon ginger, and the 1/4 cup softened butter, with a fork or by hand mix until the mixture is crumbled. Spread over top of the coffee cake.

Place in the oven and bake for 25 to 27 minutes or until a toothpick inserted in the cake come out clean

Remove from oven and cool completely on a cooling rack.