Quick chicken pie

Recipe for 4

4x Large chicken breasts
2x Leeks
8x Chestnut mushrooms
400ml Celeriac soup
1 tsp Dried tarragon
4x Rounds cooked short pastry

Cut chicken into 2cm cubes and fry off until cooked
Add leeks and mushrooms and sweat until cooked
Pour in celeriac soup
Add tarragon and simmer for 4 minutes.

Serve in a bowl and add cooked pastry