I've got a Lodge reversible cast iron grill/griddle (this model). The griddle side works great, and I've had no problems with food sticking or burning. But I've had less luck with the grill side. Specifically, any time I grill meats that have been marinated in a sugary marinade, the sugar burns and sticks to the grill.
Is that to be expected? Is there some kind of technique to grilling foods with sugar on cast iron I should be using?