Beat the jam with the baking soda and leave in the fridge for 20 min. Then add a little of the flour and water at a time, then the sugar, while stirring with a wooden spatula.
Pour the mixture into a tray with baking paper. Bake in a preheated 356°F (180 °C) oven about 30-40 min.
Wait a little, cut it into rhombuses and pour the prepared glaze over it.
To make the glaze, melt the butter in a water bath, add the sugar, cocoa and yolks.