Hi James,
I love food photography, I have studied it and practiced it for a couple of years now. In terms of lighting, the observations made by Bart are right on the money, those are the core concepts of lighting for food.
I would add a couple of things:
The camera angle and the bullseye composition work well in this photo.
The styling looks very casual, it is not polished to perfection (more on that below), that´s ok, but you have to align the whole thing in the same direction. IMO this particular dish would look great with window light as key, fresh mango salad and natural light, perfect. By the same token, the light blue in tyhe plate over black bg looks sophisticated to me, cold (and not appetizing), however that's rather subjective and culture-dependent.
Styling is a whole area of expertise in itself, easily the single most important part of food photography. Bad styling equals bad photo. Even for a casual shot, these mango slices look dry and the drips of sauce are too "shy", they seem to have fallen by accident, not as part of the design. If you really want (or need) to polish the styling, you´ll need slices neatly cut, selected among dozens and dozens of samples (from selected mangoes), watch their shape and relative proportion to each other, make them look moist and fresh, carefully place them on the plate to achieve certain visual effect..., and this is just for mango slices on a hero dish.