I love to do onions on the grill by taking toothpicks and using them to hold slices of onions together.
If you take the onion and slice so that the rings build upon each other (I hope I am clear in my explaination) then run the toothpicks into the slices it will hold them together well enough to grill them
If you take the onion and slice so that the rings build upon each other (I hope I am clear in my explaination) then run the toothpicks into the slices it will hold them together well enough to grill them