Butter tarts are a Canadian tradition. Waaaay back in the 1970s, a national contest here in Canada concluded that these butter tarts, originating from Wilkie's Bakery in Orillia, Ontario, were the best. I certainly think so and it's the only recipe I use. Add a sprinkle of toasted walnuts when you add the raisins, if you wish, or use only walnuts if you don't like raisins.