Peel and chop the onions and garlic and add to the slow cooker
Mix the flour with the beef stock until it is smooth
Add the beef and all the other ingredients to the slow cooker and mix well.
Peel the potatoes and chop into thin slices.
Top the mince with the potato slices and season with salt and pepper
Cook for 7 -8 hours in the slow cooker until the potato is tender
If you wish you can brown the top under the grill