Set up your Q for direct cooking. Place the casserole dish (without lid) at the back centre of the Q and add the oil. Preheat on high for ten minutes.
Lightly oil the steak and season with salt and pepper.
Once the Q is preheated, leave the heat setting on high. Add the onion, garlic, prosciutto and mushrooms to the casserole dish and cook, stirring occasionally, for 5-6 minutes. At the same time, add the beef to the grill around the casserole dish. Cook for 3-4 minutes per side, 6-8 minutes in total. When the onion mixture is cooked, add the flour and stir through, then add the beef from the grill.
Remove the casserole dish from the Q using the detachable handles.
Turn the Q to the roast setting and add a convection tray and trivet using tongs and/or heat proof gloves.
Add the stock and wine to the casserole, stir through, then add the thyme and bay leaves. Place the lid on the casserole dish (turning the vent control to steam) and place on the trivet. Cook for 2 hours.
In a bowl rub the butter into the self-raising flour. Stir in the parmesan and the milk. Combine well. Roll into approx. 25-30 small balls and place on top of the casserole. Leave the lid off and cook for 20-25 minutes, until the dumplings are golden and cooked through.