One of the great uses of for beef fat if you're like me and use cast-iron utensils is that you just take away the fat and use it to grease the pan before you fry anything. It gives a lovely flavor to many many dishes.
Another dish you can use it for is fried cauliflower. Simply steam some tot cauliflower florets then when their al dente put your pan or skillet over a low heat, throw in the fat lumps until they melt a bit and then just plunk the cauliflower florets over the top. Add a little salt and as much pepper as you like and then continue cooking over low heat for about half an hour until the cauliflower florets have started to brown nicely.
If you're not getting enough fat out of the beef fat, a few nubs of butter will also improve the taste at least according to my taste buds anyway.
You can use beef fat virtually wherever you would choose a nub of butter - in savory dishes.
It doesn't work quite as well in sweet dishes because it has that slightly well, beefy taste.... surprise surprise!
Hope that helps,
Mark