Melt the butter and mix it with the vegetable oil. Add sugar, flour and salt. Knead the dough, cover it with a napkin and place in a refrigerator for 2-3 hours.
Peel and core the apples (sour sorts), cut them into thin slices and sprinkle with 1 lemon juice.
Roll the dough out into a circle shape between two sheets of food paper, place the dough circle in a buttered mold, pierce the dough with the tines of a fork before baking Put the apple slices on the dough and coat with apple jam, warmed in water bath.
Bake for 30 minutes in an oven at 440 oF (225oC).
