Homemade butterscotch candy cooked to the hard-crack stage and cut into squares.

Steps

1. Put ingredients except vanilla in a heavy saucepan.
2. Stir until sugar melts but do not splash sides of pan.
3. Boil without stirring until candy is very brittle when tried in cold water in a saucer. Test often and keep the heat low towards the end or sugar will burn.
4. Pour into a greased square pan.
5. Cool slightly and then mark in squares.
6. When cold break in pieces.