I do it on high and get the grill marks and then flip it. It doesn't take long and the oil keeps it from sticking. It wilts a little but the flavor is excellent and I've experimented using flavored EVOO, Garlic, Blood Orange and did some with Jalapeno for a taco salad that lit up my mouth.
I am doing slaw for some ribs later on tonight and grilling the cabbage before preparing it for the slaw. Hell, I am a grillin' fool. Fruits, veggies, you name it. Making a grilled peach, red onion, limes and serrano salsa for tomorrow night's game in Mexico. All of that hits the grill and I made some Margs with grilled limes and oranges yesterday that were outrageous. And hot grilled fruit on Vanilla Bean Ice Cream will make you cry when you've finished it. Did some peaches with Grand Marnier and I had a mouthgasm.