Preheat the oven to gas 3 / 160C / 325°F and grease & line a deep 8" round springform cake tin
Mix together the almonds, icing sugar, lemon juice and zest. Form into 2 balls, cover and set aside
Grate the apple into a bowl, add the sugar and oil then beat vigorously. Add the water, nutmeg, cinnamon, xanthan gum and baking powder beating vigorously again, then mix in the flour, fruits and peel
Spoon half the mixture into the cake tin. Take one ball of the almond paste, roll into a 9" circle and place it on top of the cake mixture. Spread the remaining cake mixture on top of the almond paste
Bake for 1 & 1/2 - 3/4 hours. Let the cake cool then run a knife around the tin edges and turn it out onto a wire rack. Brush the top of the cold cake with the apricot jam. Take the second ball of almond paste and break off 11 marble sized pieces
Roll out the remaining almond dough/marzipan into an 8" round using the springform tin base as a guide. Place the almond dough circle on top of the apricot jam. Press the 11 balls of almond dough in a circle around the top of the cake, moistening the base of each slightly with the leftover jam
Put under the grill to slightly toast the top of the marzipan paste
