- 3/4 cup firmly packed dark brown sugar 145 grams
- 2 tablespoons granulated sugar 25 grams
- 1 large egg
- 1 large egg yolk
- 3/4 cup buttermilk * see Notes for options. 175 ml
- 1 teaspoon vanilla extract 5 ml
- 1/2 cup Dutch cocoa powder 41 grams, sift to remove lumps
- 1 cup all-purpose flour 125 grams
- 1 tablespoon of instant coffee optional
- 1/4 teaspoon baking soda
- 1/2 teaspoon baking powder
- 1/2 teaspoon table or fine sea salt
- Frosting
- 2 ounces unsweetened chocolate melted and cooled, 55 grams
- 1 1/2 cups powdered sugar 180 grams, sifted if lumpy
- 1/2 ounces cup unsalted butter at room temperature, 4or 115 grams
- Pinch of fine sea salt optional
- 1 tablespoon of whippiing cream or half and half
- 1/2 teaspoon vanilla extract