I would try these

I have some coconut sugar.

https://saltedplains.com/broiled-grapefruit-with-maple-syrup-rosemary-and-sea-salt/

https://www.whattheforkfoodblog.com/2015/02/02/broiled-grapefruit-cinnamon-honey/

http://thymeandtoast.com/rose-water-broiled-grapefruit/

"Ugh. Whatever."

https://www.floatingkitchen.net/baked-grapefruit/