makes 3 lb. Of toffee

1 1/2 cups(3 sticks) unsalted butter, cut into chunks, plus more for the pan

3 1/2 cups sugar

3/4 cup water

1/4 cup light corn syrup

1/2 tsp salt

2 tsp vanilla

1 1/2 cups whole almonds(about 9 oz.)

toasted and chopped

12 oz. Bittersweet or semi sweet chocolate, chopped

Lightly butter a 10 x 15 inch jelly roll pan.