A bit time consuming to cook (and intimidating), but quite tasty. Beef Sweetbreads. Soak em, boil em, grill em, eat em.
I ate maybe 1/5 of them, the rest of my dinner party liked them a lot, even ample sirloin, pork ribs, and pork chops.
If you're trying to "get into offal", I recommended this as a first step! (And a cheap, delicious treat)