I used to be leery of eating the hard, white fat on the grassfed/organic ox hearts I have bought in the past, years ago. But I got used to it. It's not enjoyable, and I don't think I digest/absorb it well and it seems to have the same consistency as raw suet which I also don't like either for similiar reasons. But some othr RVAFers swear by it.
On the other hand, I find the taste/texture of the white fat hanging off my raw legs of mutton to taste wonderful.
*Keep in mind that most newbies reportedly take c. 8-12 months of a rawpaleodiet to get used to the taste of raw animal foods in general and wean themselves away from cooked foods properly. Of course, this period varies greatly depending on how much or how little cooked foods one eats, the variety in the rawpalaeo foods etc. In the meantime, do a lot of experimentation and buy small amounts of dozens of different raw animal foods and make 90 percent of your RVAF intake consist, at first, of rawpaleo foods you really like, and only 10 percent of the diet should ever consist of rawpalaeo foods you find bland or dislike the taste of. Over time, some of the foods you found bland or disliked will start to taste great.*
I am a case in point. At first, I only found some kinds of raw seafood immediately enjoyable in taste(raw scallops, raw oysters and raw swordfish and similiar). I found raw grassfed meats to taste bland and raw wild game to be far too rich in taste so as to be repellent, and I couldn't stand raw organ-meats at all. But I went out and got hold of odd things like raw squid tubes or raw grassfed ox lung and started off with a diet high in raw plant foods. What had helped me is that by the time I had started, I had fortunately lost all taste for cooked animal foods(somehow my body was instinctively telling me via taste that cooked animal foods were bad given my digestive issues from those foods). Anyway, after a while I got used to the taste of raw wild game and started to enjoy it far more than any other kinds of raw meats. Also, as a result of my experimentation, I ended up with a much wider variety of raw foods than most other RVAFers, so was able to have a bit of fun with the diet.
Of course, there are always raw foods one can never get used to, due to individual tastes etc. I still loathe raw chicken, however "organic" it might be, no doubt because it's almost always heavily grainfed.