50 g Butter
1 red onion
1 Garlic clove
600 g Swiss brown button mushrooms
200 g Oyster mushrooms
2 tbsp Soy sauce
1 tsp Dried rosemary
1 tsp Paprika
75 g Ground almonds
100 g Walnuts, toasted and roughly chopped
375 g Puff pastry
2 tbsp Wholegrain mustard
1 Egg, beaten