With two whole cups of red currants, and lemon zest, this Currant Coffee Cake tastes tangy, sweet, and very refreshing. With a sweet walnut crumb topping, this is one cake that should be served with a hot tea or coffee.
Preheat oven to 350°F. Grease and line a 9x9 inch baking pan with parchment paper. Set aside.
Add the flour, sugar, and baking powder to a mixing bowl. Whisk together.
Next, add the beaten egg, softened butter, milk, and lemon zest. Beat until just combined. Batter will be very thick.
Add the currants and use a wooden spoon or spatula to mix the berries through the batter.
Transfer batter to prepared baking pan. Spread the batter out until level.
Next, add all of the crumb topping ingredients to a bowl. Use a mixer to beat in the butter. This mixture will be crumbly.
Evenly distribute the topping over the batter.
Bake for one hour. Depending on your oven, the cake may bake faster. Check at the 50 minute mark. Insert a wooden toothpick into the center of the cake. If it comes out clean, the cake is done. If not, close the oven door and bake for 10 minutes more. Test with an unused toothpick once again.
When done, remove from oven and allow to fully cool in the pan.
Slice into 12 squares and serve. Cake can be stored, covered, for 3 days.