Cake:

2 c. root beer (do not use diet root beer)

1 c. dark unsweetened cocoa powder

1/2 c. unsalted butter, cut into 1″ pieces

1 1/4 c. granulated sugar

1/2 c. firmly packed dark brown sugar

2 c. all-purpose flour

1 1/4 tsp. baking soda

1 tsp. salt

2 large eggs

Root Beer Fudge Frosting:

2 oz. dark chocolate (60% cacao), melted and cooled slightly

1/2 c. unsalted butter, softened

1 tsp. salt (I used sea salt.)

1/4 c. root beer

2/3 c. dark unsweetened cocoa powder

2 1/2 c. confectioners sugar

sea salt, to sprinkle over top of fudge frosting