Here's a yummy toffee recipe that's healthy and extremely digestible* too. Obviously, if you don't do nuts, it won't work...
1 cup honey
1 cup peanut or other nut butter
2 tbsp butter
Boil the honey in a pan gently for about 8 minutes. It will froth up and go a golden brown colour. Remove from heat and stir in the butter and nut butter. Pour into a flat pan lined with baking paper, or spoon into candy cups. Refrigerate until hard, but eat at room temperature. Before it goes rock hard, cut into pieces. It will be difficult to cut once it has set.
*Honey is apparently more digestible than sugar because it is a one-molecule carbohydrate and does not need to be broken down. In fact, every ingredient in the recipe is a single-molecule, unless you use peanut butter with additives in it.