Yes, we're grilled/broiled veggies and fruits but grapefruit. So will try this.
3 Ruby Red grapefruits, halved horizontally
¼ cup packed dark brown sugar
½ teaspoon ground cardamom
1 teaspoon Maldon salt or other large-flake salt
Preheat the broiler with a rack about 4 inches from the heat. Line a sheet pan with aluminum foil. (This isn’t totally necessary – the grapefruit won’t really stick to the pan – but it makes for the easiest cleanup.)
Place the grapefruit halves, cut side up, on the prepared sheet pan. Use a small paring knife or curved grapefruit knife to section the grapefruits, cutting around the outer membrane to separate it from the flesh, and between individual sections.
Mix together the brown sugar and ground cardamom in a small bowl. Sprinkle each grapefruit half with the sugar mixture, dividing it evenly. Sprinkle the salt atop the sugared grapefruit.
Broil the grapefruit, keeping a close eye on the pan and rotating it if needed, until the fruit is charred at the edges and caramel-y brown in the center, 3 to 5 minutes.
Let the grapefruit cool for 5 minutes before enjoying warm (I find a regular or grapefruit spoon the best tool to pop out the segments and catch all of the sweet juice while eating.)