Ingredients:
Ingredients for the cake
1 cup Cake flour
1/3 cup cocoa powder
3/4 cup granulated sugar
1 1/2 teaspoon baking powder
1/2 teaspoon kosher salt
5 teaspoon large egg
1/2 cup vegetable oil
1/4 cup strong brewed coffee, hot
3 tablespoon instant espresso
1/4 teaspoon cream of tartar
Ingredients for the filling
1/4 cup sugar
1/4 cup cold water
1/2 cup Freshly brewed espresso
Ingredients for espresso simple syrup
14 ounce Eagle Brand® Sweetened Condensed Milk
1 cup unsalted butter