Trim and peel vidalia onions, leaving a small amount on the root end.

Core the center of each onion, then slice almost all the way through to create a bloomin' onion shape.

Place 1 tsp of butter and 1 bouillon cube in the hollow core of each onion.

Place each onion in a sheet of heavy-duty foil and form a bowl around the onion.

Sprinkle Worcestershire sauce, wine, and spices over the onion. Adjust amounts to taste.

Close up the foil packets securely.

Place the foil packets on a medium-heat grill for about 1 hour.

Remove the foil packets from the grill carefully.

Open the foil packets carefully.

Add parmesan cheese and croutons to each onion.

Optional: Add water or broth to make the dish more soup-like before adding cheese and croutons.