300²µ/10½´Ç³ú chestnut mushrooms, thinly sliced
1 garlic clove, crushed
3 tbsp horseradish ±è³Ü°ùé±ð
2 tbsp olive oil
½ tsp salt
1 free-range egg, beaten
500g/1lb 2oz ready-made puff pastry
800g/1lb 12oz beef sausages, skins removed