Grandma Beisler's Caramel Fudge with Bitter Choc

1 box light brown sugar
1 T butter
1 cp whole milk

Put on stove and cook till it comes to a boil. Simmer to soft ball stage. Remove from stove and cool for a little bit. Add vanilla and beat. Pour into buttered pan.

2 squares bitter chocolate
Melt in double boiler and pour over caramel.

Mom says this is always a bit grainy, and I remember that, too.