Cut small slice off bottom of onions so they sit flat.
Cut 1/3 off top of onion so you can core out inside and make into a cup.
Remove outer layer of onions with skin, discard.
Use a knife to cut a bit of inside of each onion out being careful not to puncture bottom.
Use a spoon to scrape as much of the inside of each onion out so it makes a cup, but make sure the bottom is in tact free from holes.
Mix all other meatloaf ingredients together well and form into balls.
Fill onion holes with meatloaf mixture.
Get a piece of tinfoil big enough for 1 meatloaf filled onion. Put in middle.
Pour olive oil on top and on outside of onion, sprinkle a bit of basil or oregano if desired.
Bring sides up and close tinfoil.
Put all wrapped and prepared onions on the grill (close), or on a cookie sheet and in the oven at 300 degrees for about 30 minutes or until meatloaf is as done as you'd like it to be.