cup unsweetened cocoa powder
teaspoon pure vanilla extract or vanilla paste
Juice of 1 lemon
Pinch of kosher salt
For Serving: Your favorite ice cream or whipped cream.
For the cake: Preheat the oven to 340 degrees F. Spray the inside of a medium (32-ounce) reusable oven-safe silicone container with nonstick cooking spray.
In a medium bowl, whisk together the flour, sugar, cocoa powder, baking soda, baking powder and salt. Add the coffee, oil and buttermilk and mix until well combined. Add the egg and vanilla and whisk until the batter is smooth, 2 minutes or so.
Pour the batter into the prepared container and place it standing up on a baking sheet with the seal open. Bake until a toothpick can be inserted into the center of the cake and removed cleanly, about 50 minutes. Let cool completely, about 1 hour.
For the vanilla baked cherries: Combine the cherries, sugar and vanilla in a small (16-ounce) reusable oven-safe silicone container. In a small bowl, combine the lemon juice and cornstarch; pour over the cherries in the container. Zip the container, leaving the seal open 1 inch to vent. Place the container standing up on a baking sheet and bake until the cherries are simmering in liquid, about 30 minutes.
Open the container carefully. Stir the cherries and allow to cool completely, about 1 hour.
For serving: Remove the cake from the medium container then cut the cake into 4 slices. Top with the vanilla baked cherries and ice cream or whipped cream.