3. Slice the mushroom heads into thick slices, then into sticks and cubes. Mix with the celery and carrot.
4. Slice the truffles into very thin slices. The quality of the truffles is important in this soup: choose fresh truffles if possible.
5. Out of season, use canned truffles. Use 30g of cooked truffles per person instead of 20g of fresh truffles. Pour 1 tbsp of Noilly Prat into four porcelain bowls with a capacity of 25 to 30 cl, suitable for the oven. Add 1 heaping tbsp of mirepoix. Cut the foie gras into cubes. Divide them into the bowls.
6. Cut the chicken breast into slices of 1 cm, then into cubes. Divide them into the bowls. Also add the truffle slices. Pour broth over it, stopping 1.5 cm from the top of the bowls.
7.Spread the puff pastry on the work surface. Cut 4 discs with a diameter of 13-14 cm. Place a disc on each bowl. Fold the edge onto the sides of the bowls, gently pressing to seal.
8. To cut the pastry discs to the right size, measure the diameter of your bowls and add at least 3 cm. Then place a round object (bowl, saucer, metal circle) of that diameter on the pastry and cut around it. Mix the egg yolk with 1 tsp of water and a pinch of salt. Brush it onto the pastry.
9. Bake for 20 minutes. Cut the crust of the soups with the tip of a knife. Serve immediately.
A recipe discovered on the website Académie du Goût.