This burger is far from "awful," and is the perfect way for the beginner (or the person traumatized by childhood liver and onions) to practice incorporating valuable organ meats into their nutrition.
The one pound of beef could actually be a mix of beef, pork, bison, game, or even poultry. Use what's handy. Feel free to mix it up when it comes to the liver, too. Heart is a muscle and has a much milder taste than liver. Kidney and spleen would work, as well. Just be sure you get your organ meats from responsibly fed sources like grass-fed cattle.
Recipe by Whole Life Challenge® at Offal Burger for Beginners https://www.wholelifechallenge.com/the-best-offal-burger-for-beginners/