1 1/2 cups all purpose flour

1 cup white sugar

1/4 cup cocoa powder, sifted

1 teaspoon baking powder

3/4 teaspoon baking soda

1/4 teaspoon salt

1/3 cup unsalted butter, melted

1 cup warm water

1 tablespoon lemon juice (or vinegar)

1 teaspoon pure vanilla extract

Chocolate Frosting:

6 ounces (170 grams) semi-sweet chocolate, chopped

3/4 cup (180 ml) heavy cream (35% butterfat)

1 tablespoon unsalted butter, room temperature