I recently was at one of those all-U-can-eat asian buffets where they had
at the dessert station simply quartered-sliced bananas with a red glaze
poured over them. I can't quite put my finger on the taste, although it
was pleasant. Interestingly, the sauce possibly had a dual purpose of
preventing that ugly brown thing happening when exposed to long?

Does anyone know what this is and where I can make/purchanse it?

Thanks for any help.