how long to slow cook beef casserole
1 Place the lid on the slow cooker and cook for 3-4 hours on HIGH or 7-8 hours on LOW. 2  Stir in the peas 15 to 20 minutes before serving and cook on HIGH. 3  Taste and adjust seasoning, stir in the parsley and remove bay leaf before serving.ethod (Serves 6). 1  Pre-heat the slow cooker on HIGH for 20 minutes. 2  Meanwhile, in a large frypan, heat the olive oil and brown the beef in small batches over high heat for a couple of minutes. 3  Layer carrots, celery, potatoes and onions in the bottom of the slow cooker bowl.