Pan-fried liver smothered with caramelized onions is a nostalgic, nutrient-dense dinner rich in iron and protein. This old-fashioned family dish delivers bold flavor and impressive nutritional value.
Slice the beef liver into 1/2-inch strips and soak them in milk for at least 30 minutes to mellow the flavor.
Peel and slice the onions thinly. In a large skillet, melt butter with 1 tablespoon olive oil over medium-low heat. Add onions and cook, stirring often, for 12–15 minutes until deeply caramelized.
Remove onions from the skillet and set aside. Drain liver, pat dry, then dredge lightly in flour mixed with salt and black pepper.
Add remaining olive oil to the skillet and increase heat to medium-high. Add liver pieces in a single layer and sear for about 2 minutes per side, being careful not to overcrowd the pan.
Return caramelized onions to the pan. Reduce heat to low and cook together for 2–3 more minutes, letting flavors meld. Garnish with chopped fresh parsley before serving.