That sounded all along like it was going to end up in the delicious category. I'll be quite tempted to try it as the weather gets more into autumn here.
Yes, it was mouthwatering, and the aroma was amazing.
I have sufficient for seconds tomorrow; the Japanese knife I had laid beside my plate was redundant, as - quite literally - the meat was falling off the bone, and only needed the nudge of a spoon to complete its descent into the rich and luscious gravy/sauce, rather than the attentions of a knife to ease it away from the oxtail bones.
Rice worked perfectly well with the dish.
The only thing to note is the time required, this dish requires plenty of time to prepare and to cook and that means advance planning, and a day and a half, or two days, for it to come out properly, although the ingredients are not that difficult to lay hands on.
As I had the time, and realised that there was no way it would be ready yesterday, I had it marinading for 20 hours - all the sources suggested "at least" eight, and that having it marinading overnight worked best. (And the marinade is added to the stock, which the oxtails are simmered in, so it is not wasted and further enhances the flavour).
Yesterday, it took me around an hour and a half between soaking and washing the oxtails, and preparing the marinade; then, bathing the oxtails overnight, in my case, allowing them 20 hours.
Today, prior to the oxtails beginning their simmering journey, there was almost an hour of preparation (I slowly sautéed some onions in a separate sauté pan - which none of the recipes mentioned - because slowly sautéed onions add a wonderful base of flavour to almost any slow simmering dish), and browned the oxtails in a mix of oil (I used olive oil) and caramelised sugar. This was followed by almost six hours of simmering, (i stock plus the marinade, plays a little extra of tomato ketchup, tomato puree, pimentón, and Worcestershire sauce) checked for flavour - and that it hadn't dried out - every hour or so.
Anyway, a wonderfully warming, tasty, rich, soothing (yet slightly spicy) dish.