Thaw calf liver; pat dry with paper towel; place slices in a large shallow pan and pour Catalina salad dressing over the slices, coating both sides well; let liver marinade for 15 minutes1 pound calf liver1½ cups Catalina or French salad dressing
Slice onions; set aside 3 medium sliced sweet yellow onions
In a separate shallow bowl, combine flour, garlic powder, salt and pepper 1 cup all-purpose flour½ teaspoon garlic powder1 teaspoon salt½ teaspoon black pepper
Make the Liver & Onions
In a large skillet, melt 1 stick of butter; add sliced onions and cook 10-12 minutes until onions are tender; once tender, transfer to a plate; leave any remaining melted butter in the skillet1 stick butter
Remove the Catalina soaked liver slices from the pan, allow any excess dressing to drip off, then dredge each piece in the flour mixture one by one; shake off any excess flour
Add 2 more tablespoons of butter to the skillet; once melted, place the lightly flour coated liver slices in a single layer; cook 3-4 minutes per side; the liver is done when it reaches an internal temperature of 160°F; once done, transfer to a plate2 tablespoons butter
Make the Brown Gravy
In the same skillet you cooked the onions and liver, turn the heat to medium and add ½ cup of broth and, using a wooden spoon, scrape up any browned bits
Sprinkle flour into the skillet, continuously whisking; gradually add in the remaining broth and cook gravy on medium heat until it thickens a little; at this point, you can strain the gravy through a fine mesh strainer if you like, then return it back to the skillet¼ cup all-purpose flour
Add cooked onions and cooked liver to the gravy; coat the liver slices with gravy, cover and cook on low heat for 5 minutes; taste for salt and pepper; serve and enjoy
Notes
If you're making more than 1 pound of liver, you may need to add more butter to the skillet between batches.