Peel onions and using an apple corer, cut 1/4 out of the middle of the onion and using a knife cut the onion into four wedges not going all the way through the onion.
Place cut onions on a sheet of heavy duty aluminum foil.
Put one beef bouillon cube in hole in the middle of the onion.
Put one teaspoon of butter on top of the bouillon cube.
Sprinkle with salt and pepper.
Fold up aluminum foil around onions making sure that it is tightly around onions.