This was my Grandma's recipe and has been a family favorite for years. Every time she would make these we would practically inhale them. Now, I make them on all the holidays. My family absolutely raves about them. They get gobbled up so fast that I always have to make a couple batches!
Note: I don't put raisins and nuts in the filling mixture at first. I add them to each individual tart after I've poured in the mixture. About 5-8 raisins and a sprinkle of nuts to each tart.
Also, to get a really flakey crust, keep all ingredients and utensils cold. I put my bowl, rolling pin, pastry whisk, and the flour I will use in the freezer prior to making and I keep the butter and shortening in the fridge until ready to use