Si and Dave make an Austrian Linzertorte posh jam tart cake on the Hairy Bikers’ Bakeation.

The duo says: “This is often said to be the oldest cake in the world and dates back to at least 1653, but no one knows who invented it. There are lots of variations and the oldest known recipe is in a cookbook that was written 350 years ago. Named after the Austrian city of Linz, which is justly proud of this delicious creation, the linzer torte has a crumbly pastry base, a jam filling and a lattice top. This is our version – it’s a sort of posh jam tart really.”

The ingredients are: 150g caster sugar, 150g plain flour, plus extra for dusting, 150g ground almonds, good pinch ground cinnamon, 150g cold butter, cut into cubes, 1 egg, beaten, 200g good quality raspberry jam and ½ tsp icing sugar, to decorate (optional).