1) Preheat the oven to 180C/Gas 4.
2) In a large bowl, mix the butter and sugar, then add the egg yolk and mix well. Add the flour and almonds and blend well, but keep the mixture a bit crumbly.
3) Put half the mixture into a greased 32cm by 23cm baking pan. Bake for 20 minutes, and then remove the pan from the oven. Spread the jam evenly over the top, leaving about 0.5cm from the sides. Crumble the remaining dough evenly over the jam and pat lightly. Bake for another 40 minutes. Serve after cooling.
This recipe was provided by professional chefs and has been scaled down from a bulk recipe provided by a restaurant. The Food Network Kitchens chefs have not tested this recipe, in the proportions indicated, and therefore, we cannot make any representation as to the results.