Rhubarb and strawberry jam
Mix the rhubarb, strawberries, lemon juice, vanilla and preserving sugar in a wide pan, bring to the boil while stirring, then boil fast for approx. 4 mins., leave to cool.
Place the butter in a bowl, mix in the icing sugar and salt. Add the eggs and continue to beat until the mixture becomes lighter in colour. Stir in the lemon zest. Mix the almonds, flour and vanilla, stir into the egg mixture. Press 3/4 of the pastry into the prepared tin, creating a rim of approx. 2 cm.
Stir the rhubarb and strawberry jam until smooth, spread over the pastry base leaving a gap of approx. 2 cm all the way around.
Mix the remainder of the pastry with the flour, knead briefly, roll out on a lightly floured surface to approx. 4 mm thick. Cut out hearts using cutters, place on top of the jam, brush the pastry hearts with egg.
Approx. 40 mins. in the lower half of an oven preheated to 180°C. Remove from the oven, allow to cool slightly, remove the tin frame, slide the Linzer torte onto a cooling rack and leave to cool.