This is very quick to prepare; I have marinated the salmon for as little as 1/2 an hour, yet it has plenty of flavor. For ease of preparation, we buy individually portioned salmon from a big-box store. We prefer to grill it on our indoor contact because it's SO quick. I've used straight brown sugar, Splenda Brown Sugar Blend, and straight Splenda - and they all work very well. But I think the brown sugar or the brown sugar blend will give you a little better color.