Beef liver and onions is a classic dinner that's simple, filling, and easy to make at home. If you've picked up liver at the grocery store and aren't sure what to do with it, this is the place to start. When cooked right, liver does not have that strong metallic taste many people worry about. A quick soak in milk, slow-cooked sweet onions, and a little butter make all the difference. The result is a tender dish full of flavor.
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Copper and Iron in Beef Liver
For many people, beef liver has a slightly metallic taste, which comes from its high iron content.
It's also rich in copper, retinol, and B vitamins, which support how your body uses iron.
As Morley Robbins often points out, copper helps move iron through the body so it can be used properly.
Ingredients
Makes 4 servings
You can also use chicken livers with this recipe. If using, follow the cleaning steps from my Air Fryer Chicken Livers and Onions post before cooking.
- Beef liver (or calf's liver), sliced (3 cups chopped)
- Milk
- Eggs
- Yellow onions, sliced
- Sugar
- Butter, divided
- Olive oil
- Kosher salt and black pepper
- Fresh parsley, for garnish
How To Prep Beef Liver
You may notice a thin, shiny film on parts of it. That's the membrane. Use the tip of a sharp knife to gently lift that edge, then pull it back while trimming underneath. It usually comes off in strips. Don't worry about getting every bit.
Next, look for any visible connective tissue or stringy spots and trim those away.
Slice the liver into even pieces, about ½-inch thick.
How To Bake Beef Liver and Onions
- Place the liver in a shallow dish and cover with milk. Let sit for 20-30 minutes. Drain and pat dry with paper towels.
- While the liver is soaking, hard boil 4 eggs, drain and peel.
- Heat 1 tablespoon butter and 1 tablespoon olive oil in a large skillet over medium heat. Season with salt, pepper, and a bog pinch of sugar. Add sliced onions and cook for 10-15 minutes, until soft and lightly browned. Set aside.
- Preheat oven to 375°F. Lightly brush a baking dish or sheet with remaining olive oil.
- Season the liver with salt, pepper, and garlic powder. Lightly dredge in flour, if using, and shake off excess.
- Arrange liver slices in a single layer without crowding.
- Top with the cooked onions and dot with the remaining butter.
- Bake for 15-20 minutes, until just cooked through.
- Plate the liver and garnish with fresh parsley. Serve hot.
Strorage and Reheating
Store leftover beef liver and onions in an airtight container in the refrigerator for up to 3 days. Keep the onions with the liver so it stays moist.
To reheat, warm gently in a skillet over medium-low heat with a little butter or oil. This prevents it from drying out.
If you plan to freeze it, wrap tightly and freeze for up to 2 months. The texture may change slightly once thawed. For best results, sauté fresh onions, then add the thawed, sliced liver to the skillet at the end just to heat through.
Takeaway
This baked beef liver and onions recipe is a simple, high-protein meal packed with iron, copper, and B12.
Fresh yellow onions are sautéed until soft and sweet, then baked in the oven with the beef liver.
Start by soaking the liver in milk, top with the sautéed onions, and finish in the oven until tender.
It's an easy recipe that turns a classic cut into a nutrient dense home-cooked dinner.
More High Protein Recipes
- Steak and Cheese Omelet
- Baked Lamb Chops
- Medium-Rare NY Strip Steak
- Coconut Oil Shrimp
- High-Protein Fish Recipes
- Pan Seared Snapper Fillets
Looking for more easy, high-protein meals? Browse all of my high-protein meal prep recipes for simple ideas you can use throughout the week.
FAQ
Soaking the liver in milk for 20-30 minutes helps mellow the flavor. Cooking it with butter and onions also balances out any strong taste.
Grass-fed beef liver is preferred because it has a better nutrient profile and comes from animals raised on a more natural diet. It can also have a slightly cleaner taste. If you have the option, choose grass-fed, but regular beef liver will still work well for this recipe.
Do not overcook it. Liver cooks fast and should be removed from the oven as soon as it's just done. Overcooking is what makes it dry and tough.
You don't have to, but it's recommended. It softens the flavor and improves the texture, especially if you're new to cooking liver.
Yes, slightly. It should be cooked through but still tender inside. If it's fully gray and firm all the way through, it's likely overcooked.
Beef liver is one of the richest sources of iron, copper, and B12. It's often included in diets to help support healthy red blood cell levels.
Beef Liver and Onions
Ingredients
- 1 pound beef liver or calf's liver
- ½ cup milk
- 4 large eggs
- 3 cups sliced yellow onions about 3 medium onions
- 1 teaspoon sugar
- 3 tablespoons butter divided
- 1 tablespoon olive oil
- Kosher salt and black pepper
- Fresh parsley chopped, for garnish
Instructions
- Place the liver in a shallow dish and cover with milk. Let sit for 20-30 minutes. Drain and pat dry with paper towels.
- While the liver soaks, hard boil the eggs. Peel and set aside.
- Heat 1 tablespoon butter with the olive oil in a large skillet over medium heat. Add the onions with a pinch of salt, pepper, and sugar. Cook for 10-15 minutes until soft and lightly browned. Set aside.
- Preheat the oven to 375°F. Lightly coat a baking dish or sheet with olive oil, or line with parchment paper.
- Season the liver with salt and pepper.
- Arrange the liver in a single layer. Top with the cooked onions and dot with the remaining butter.
- Bake for 15-20 minutes, just until cooked through.
- Serve hot with sliced eggs and a sprinkle of fresh parsley.
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