I use a great oven pork chop recipe I got from my sister: slather pork chops on both sides with mayo, place them in a pan, put mustard and a little brown sugar on top of each chop and pour a little milk between them (just part way up the sides)...of course the mayo separates, but it's always very good, and when it turns out ideally, the mayo sort of toasts and forms something of a delectable crust on the tops. So it should have occurred to me that mayo would make a good rib slather, but it didn't.
I generally avoid sugar, so on the oven pork chops I use a spidery drizzle of blackstrap molasses and some sucralose. However, I also have sugar subs that have textural and chemical qualities, and combining them in different ways makes it possible to juggle the degree of sweetness vs. cooking qualities vs. different kinds of cooking qualities...the primary textural subsitute I use in polydextrose, which happens to have very little sweetness, but has the sticky and gooey qualities of sugar in great abundance. (Also a somewhat disproportionate amount of the browning qualities.) On the next rib cook, I'll try the mayo along with an increased proportion of the polydextrose. (Will also try poly D on the oven chops...should have thought of that before too.)
Wonder why japanese mayo doesn't separate? (The Wikipedia article had nothing enlightening on that point.)