If you love it so much buy only grass fed/organic, if not organic than at LEAST limit yourself to calves liver. But I'm telling you, do your body a favor and SEEK OUT organic and buy organic calves liver if you love the stuff.
You are eating concentrated toxins when you eat liver. If you are eating liver from feedlot cattle every antibiotic, steroid, pesticide, and antiparasitic that cow was exposed to is going into YOUR body. I wouldn't touch the liver of a conventionally fed/raised cow with somebody else's hands.