Preheat oven to 190 degrees C.
Heat some olive oil or ghee in a large frying over medium heat.
Gently fry leek and onion for a few minutes until translucent, then add garlic and fry for a couple more minutes.
Add the chicken and fry for approx 10 minutes or until just cooked, stirring it around intermittently.
Add the mushrooms and fry for a few more minutes.
Add spelt flour, stir in and fry for 1 minute.
Gradually add the liquid, followed by the mustard, herbamare and dulse flakes, and simmer for 5 minutes.
Put the chicken mix into a baking dish ( I used was 29cm x 9cm) and cover with the pastry.
Brush on the lightly beaten egg and using a sharp knife puncture a few slits through the pastry
Bake for 30-35 minutes until golden.
Serve with steamed vegetables, cauliflower mash or big garden salad