Butterscotch.
Does anyone remember the Mastercraft Butterscotch, wrapped in silver paper, with the box featuring a cow. The ears were the capital M & the body spelt the rest of the brand name. Inside were ( I think) 3 wrapped bars of Butterscotch, & if you could leave them long enough, before eating, then the outside caramelised. I could never wait that long. I have enquired at lolly shops, but no one seems to remember them.