What could possible be bad about apples, walnuts, raisins with a streusel topping. There are hundreds of such recipes but for some reason or other they all seemed to lack something. This recipe makes two deserts so you can freeze one for later use and there is never a question about their being homemade. While this recipe looks hard it is not. The trick to doing this easily and fast is to use time wisely. While the dough is cooling down, peel, core, and slice the apples. Prepare the balance of the apple mixture so that the mixture can be completed just before using. Make the struesel topping and have it ready to go once the apples are mounded on the dough in the tart pan. Note that some recipes for apple pies, tarts and galettes call for mixtures of apples. I have substitued, with good results, 2 or 3 Jonagold for an equivalent number of granny smiths. I also expect that Cortland, Macoun or Empire would also be good but I would still use the granny smiths in at least equal proportion.