I too long for beef dripping, but for that you need a large joint of not too lean roast beef, so that you get the fat as well as the juices to pour into a bowl to solidify. I rarely if ever roast beef, but the occasional small joint i do buy, is usually so lean that little or no fat comes off it.
DH and I enjoy offal and we have liver or kidneys about once a week, served in several different ways. I love heart (DH doesn't) and when my father was alive and staying with us, and DH was absent on business, I used to get one or two from a local butcher and stuff and slice them and cook them gently in the oven and we would both eat them appreciatively.