Cut a 10-12 inch piece of foil. Use heavy duty if you can
Brush soft butter over the surface of the foil. You can brush oil or spray oil as well.
Place the sliced onions as the base layer. It is really important that the perogies are not on the base layer.
Place the sausage "coins" on top of the onion.
Add the perogies on top of the sausage. Again, you want to do everything you can to avoid having the perogies touch the foil surface.
Fold one side of the foil towards the center, then the bottom, then other side, then top.
Add foil pack to BBQ (med/high heat) or onto the hot coals of a fire. The key to not burning your foil packs and not having them stick is to avoid direct flames.
There is no need to flip your foil packet. Check after 10 minutes for doneness. These take approximately 20 minutes on the grill on high heat.
Remove the foil packets (carefully with tongs) from the heat. Allow to cool for 3-5 minutes. Take care opening the packets as they will have some built up steam.
Add toppings of choice.