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Classic Calf Liver And Onions Recipe With Rich Caramelized Flavor - A Comforting, Old-School Favorite

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Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings 4 servings

Ingredients
  

  • 1 to 1.25 pounds calf liver, sliced 1/4 to 1/2 inch thick
  • 2 large yellow onions, thinly sliced
  • 3 tablespoons butter, divided
  • 2 tablespoons olive oil, divided
  • 1/2 cup all-purpose flour, for dredging
  • 1 cup beef or chicken broth (low sodium preferred)
  • 1 tablespoon Worcestershire sauce (optional but recommended)
  • 1 teaspoon Dijon mustard (optional, for depth)
  • 1 to 2 teaspoons red wine vinegar or fresh lemon juice
  • Kosher salt and freshly ground black pepper
  • Fresh parsley, chopped, for garnish (optional)
  • Milk or buttermilk for soaking (optional, see notes)

Instructions
 

  • Prep the liver: Pat the slices dry with paper towels. If you prefer a milder taste, soak in milk or buttermilk for 30 minutes in the fridge, then drain and dry well. Trim any visible membranes.
  • Season and dredge: Season both sides with salt and pepper. Place flour on a plate and lightly coat each piece, shaking off excess. A light dredge helps browning and a silky pan sauce.
  • Caramelize the onions: Heat 1 tablespoon butter and 1 tablespoon olive oil in a large skillet over medium to medium-low heat. Add the onions and a pinch of salt. Cook, stirring occasionally, until golden and soft, about 15–20 minutes. If they brown too fast, lower the heat.
  • Build the onion sauce: Add 1/2 cup broth to the onions and let it reduce by about half. Stir in Worcestershire and Dijon if using. Transfer onions to a bowl and keep warm.
  • Sear the liver: In the same skillet, add 1 tablespoon butter and 1 tablespoon olive oil over medium-high heat. When hot and shimmering, add liver in a single layer. Do not crowd; cook in batches if needed.
  • Cook quickly: Sear 1–2 minutes per side for medium-rare to medium, depending on thickness. The center should be slightly pink; overcooking makes liver tough. Remove to a warm plate and tent loosely with foil.
  • Deglaze and finish: Lower heat to medium. Add remaining 1/2 cup broth to the pan, scraping up browned bits. Whisk in the remaining 1 tablespoon butter. Return onions to the skillet and simmer 1–2 minutes until glossy.
  • Brighten: Off heat, stir in vinegar or lemon juice to taste. This balances richness and cuts any bitterness.
  • Combine and serve: Nestle the liver back into the onions for 30 seconds to warm through. Taste and adjust salt and pepper. Garnish with parsley and serve right away.