This recipe demonstrates how making a simple sauce can make a big difference to the outcome of a meal. Emperor fish, or red snapper as it is more commonly known, is a firm-fleshed white fish that takes well to pan-searing, as here. You could serve it with a lemon wedge for squeezing, but it's even better with a two-ingredient sauce is made by boiling honey and balsamic vinegar until reduced to a thick syrup.