These go in your mouth, the morning after.
Get your grill hot enough to cook frozen burgers. Then little olive oil on grapefruit half. The time it takes to cook one side will be enough to char the top. Then flip them up onto the warmer above the grill. Finish them off with some maple syrup glaze… And have these ready for that morning after the night before.
The real taste and actual sweetness does come out after grilling and chilling overnight. And this method also allows you to peel the grapefruit liked an orange.