INGREDIENTS
1/2 cup
unsalted butter, softened
1 1/2 cups
granulated sugar
1
large egg, at room temperature
1 tsp
vanilla extract
3/4 cup
stout beer
1/4 cup
(55g)vegetable oil
1 1/2 cups
all-purpose flour
3/4 cup
cocoa (60 g) powder
1/2 tsp
baking soda
1/2 tsp
salt
1/2 cup
blackberries
2 cups
(1/2 lbs) powdered sugar
1 tsp
fresh lemon juice
1/2 tsp
vanilla extract