Chicken and shiitake pie | Meadow Mushrooms

Ingredients

• 2 skinless chicken breasts, halved
• 6 skinless chicken thighs
• 1 teaspoon salt
• 1 cup cream
• 100g unsalted butter
• 1 small onion, chopped
• 1 leek, sliced
• 1 celery stalk, finely chopped
• 200g shiitake, halved or quartered
• 250g button mushrooms, halved or quartered
• 5 tablespoons flour
• 250ml chicken stock
• Quarter of a cup white wine
• 3 tablespoons fresh or 1 teaspoon dried tarragon, chopped
• 1 egg
• 400g savoury short pastry