Unroll a first puff pastry. Spread the applesauce in a thin layer leaving 2 cm of free edge.
Then spread the almond cream evenly over the applesauce.
Place the fava rather towards the outside of the cake.
Prepare the gilding: mix the eggs with the milk using a whisk.
Brush the free edge of the cake. It will help you to weld the 2 doughs.
Close the cake by covering it with the second puff pastry.
Then weld the edges together: either by lightly pressing the two dough together with 3 fingers or by "chipping" it. To do this, with the tip of a knife, bring the dough towards the center of the cake by directing it with the blade of a knife at an angle (look for videos for further explanations).
Brush the cake with the gilding mixture.
Reserve the cake in the refrigerator until the next day, or between 30 mn and 1 hour if you prepare it on the D-day. This will help to weld the two doughs together.
When you take the cake out of the fridge, draw patterns on the top of your cake with the tip of a knife (rosette, flowers, stripes, etc...).
Then, brush the cake again with the gilding.
Make 4 holes with a knife so that the cake does not peel off during cooking.
Bake for about 30 minutes at 180°C, checking regularly that it is cooked. Do not hesitate to turn a bit the cake in the oven so that it cooks evenly.
Once cooked, you can add a sugar syrup on the cake to make it even shinier. To do this, first melt some sugar in a skin of water and let the mixture cool down. Then brush the cake with the syrup with a food brush.