Place the liver slices in a bowl and cover with milk. Let them soak for at least 1 hour (or up to overnight) in the fridge. This helps remove any bitterness and makes the liver extra tender.
Make the Honey Garlic BBQ Sauce
In a small saucepan, melt butter over medium heat. Add garlic and sauté for about 30 seconds until fragrant. Stir in honey, BBQ sauce, soy sauce, apple cider vinegar, and smoked paprika. Simmer for 3-4 minutes until slightly thickened. Remove from heat and set aside.
Prep the Liver
Drain and pat the liver slices completely dry with paper towels. Season both sides with salt and pepper.
Sear the Liver
Heat olive oil or butter in a large skillet over medium-high heat. Sear liver slices for about 1-2 minutes per side, until browned but still slightly pink inside. Overcooking will make them tough, so be careful!
Glaze and Serve
Reduce the heat to low and pour the honey garlic BBQ sauce over the liver. Let it coat the slices for about 30 seconds, then remove from heat. Garnish with fresh parsley and serve hot!