Well, I don't know about this fruit jam or whatever it is, but as far as the brains and sweetbreads, you may as well wonder about me, too. I grew up often having calf brains made with scrambled eggs. It is actually delicious and does not have a wierd taste or texture, at least not to me. Also, sweetbreads which are breaded and fried crispy or creamed are also delicious.
The problem for me is that the stores don't carry these items any more. I used to be able to special order them, but not any more. The grocery store butcher told me they are all sent to gourmet restaurants. I guess that's all well and good because those foods are loaded with cholesteral!
One thing I CAN still get is marrow bones which I use to make beef stock along with a knuckle bone and the beef. On RARE occasions (the cholesteral thing again) I will treat myself by spreading the marrow on white bread or toast and sprinkle with a little salt. OMG, is that good! In fact, marrow on toast was featured as one of the chef's choices on Best Thing I Ever Ate.
Did you ever see chef Chris Cosentino on Chefs vs. City? Well at his California restaurant, he specializes in offal and knows all about brains, sweetbreads and marrow along with all the pork dishes he prepares.
I guess it all depends on what you grew up with. Anyway, I guess I will stop now.
P.S. I really am not wierd!