recipe for beef liver

Ingredients: 1 pound beef liver, sliced into thin pieces 2 large onions, thinly sliced 2 tablespoons olive oil or butter 1/2 cup all-purpose flour (optional, for dredging) 1 teaspoon salt 1/2 teaspoon black pepper 1 teaspoon paprika (optional) 1/4 cup beef broth or water (optional) Fresh parsley, chopped (for garnish) Lemon wedges (optional, for serving)