Dice onion and fry off in pan with diced bacon. Sear steak (mine was cut into 4x250 gram pieces) put in slow cooker. Add 1 cup of gravy mix, 1tableapoon of tomato paste and a good splash of Worcestershire sauce.
Cook on high for 2 hours, turn to low for 4-6 hours. Taking lid off for last hour to thicken gravy.
Prepare pastry, shred beef, spoon half a cup of filling into short crust pastry in pie cooker top with cheese and seal with puff pastry lid. Cook for 15 mins..