Take the dough out of the fridge about 10 minutes before processing. Cut the nougat into 30 (approx. 1.5 x 1.5 cm wide, 3-4 mm thin) squares.
Cut the short pastry in half and roll out into rectangles (9 x 30 cm) on a floured work surface. Mix egg and milk, spread a thin layer of the shortcrust pastry. Spread the nougat on top of the pastry at equal intervals.
Carefully place the other short pastry sheet on top and press down gently.
Cut into 30 squares (3 x 3 cm) with a dough wheel. Spread the biscuits with the remaining egg-milk. Place them on a baking tray lined with baking paper and bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for about 12 minutes.
Remove the biscuits and let them cool on a cake rack for about 20 minutes.
Melt the remaining nougat over a warm water bath. Dip half of the biscuits with a corner and decorate with fir trees. On the other half with a teaspoon, put a small blob of nougat on each.
Decorate with fir trees. Let it cool down.