This I got from a lady at the post office many years ago. It is a great recipe, but boy is it finicky.
Make sure that the almonds you use are not raw almonds (if they are raw it will say so on the package). I used raw one once and had to throw it all out because they dumped a bunch of grease into it.
You have to stir it constantly when making the butter and sugar part and once it starts to turn color, it turns pretty fast.
English Toffee
12 oz. semisweet chocolate chips
1 pkg. slivered almonds (precooked ones, not raw)
1 c. finely chopped walnuts
1 lb. butter (no substitutions)
2 c. sugar
Combine butter and sugar in cast iron skillet (must be cast iron). Cook over medium, stirring constantly until it reaches the desired shade of brown. I like the color of brown sugar. Stir in almonds. Spread in greased 9 x 13 pan. Melt chocolate chips. Spread over toffee mixture. Sprinkle with walnuts. Chill at least a couple of hours. Break into pieces. Depending on how long you cook the toffee part, it will be either chewy or crunchy. The longer you cook it, the crunchier it gets.