Heat oil in slow cooker and brown steaks well on each side. Remove and set aside.
Add butter to slow cooker when melted add onions & garlic and cook until onions are transparent. Add red wine let it cook off for about a minute. stir in extra flour and cook for 2 minutes.
Gradually add stock, then add Vegemite, tomato paste and Worcestershire sauce & beef stock powder.
Put meat back into slow cooker, cover lid with a tea towel or lid cover and cook on LOW for 5hrs or until tender.
Taste add more salt & pepper if needed.
Serve with mash potatoes and your favourite sides.