Dark Creamy Hazelnuts Filling Cake

Today's my Dad's celebrating his birthday, so I baked this wonderful taste cake!

Dark Creamy Hazelnuts Filling Cake

Ingredients: 

cookie:

1,3/4 cups wheaten flour

2 cups white sugar

2 teaspoons baking soda

1 teaspoon baking powder

1 teaspoon salt

2 eggs

1 cup strong brewed coffee

1 cup buttermilk(you can buy it or make by yourself(you'll need 1 cup milk and 1 tablespoon lemon juice))

1/2 cup oil(I used sunflower oil, but you can also use olive oil)

1 teaspoon vanilla

filling:

1/2 cup white sugar

2 tablespoons flour

1/4 teaspoon salt

1/4 cup cream

1/4 cup milk

2 tablespoons butter

1/2 cup chopped hazelnuts

1 teaspoon vanilla

frosting:

1,1/2 cups confectioners' sugar

1/4 cup softened butter

pinch salt

half bar melted chocolate

1,1/2 tablespoons milk

1 teaspoon vanilla

Instructions:

1.In a bowl combine flour, white sugar, baking soda, baking powder and salt. 

2.In a cup of milk pour in the lemon juice and wait for a few minutes.

3.Add eggs, brewed coffee, buttermilk, oil and vanilla in the bowl with flour mixture. Beat for 2 minutes on medium speed.

4.Heat the oven to 175 degrees(Celsius). Butter and flour two cake pans(I used 18,5x18,5cm) and put the batter in. Bake for 30 minutes. Cool for 10 minutes, then remove from the pans.

5.Filling making process: In a small saucepan or pot combine sugar, flour, salt, cream, milk and butter. Cook over medium heat until the mixture is creamy. Remove the saucepan/pot from heat, and stir in chopped hazelnuts and vanilla. Cool completely. Then spread this mixture on the cookie and put another one on.

6.Frosting making process: In another bowl mix sugar, softened butter and salt until fluffy. Add melted chocolate, milk and vanilla. Beat until well blended. Then frost the top and all the sides of the cake.

YUUUMMI!!!

P.s. Baking this cake requires a lot of patience, as it takes plenty of time. But I can say: it definitely worths that!