Grilled Potatoes and Onions

On a large piece of heavy duty foil, spread butter or spray with olive oil.  Slice potatoes and onions onto the foil.  They will shrink, so make a little more than you think you'll need.  Sprinkle with salt, pepper, sweet basil or other herbs.  Grated carrots or grated sweet potatoes could be added for delicious flavor and color.  Add slices of butter over the top.  Wrap foil securely by folding over the top several times.  Fold in the ends.  Grill on a medium hot grill, carefully turning several times to prevent burning.  A conventional oven works too.  You may need to peek into one end to see if they are done.  These usually require at least 30 minutes, so if you are grilling meat that takes less time, give the potatoes a good head start.  Delicious!