Preparation Sprinkle liver with salt and pepper; dust with flour. Melt butter in heavy large skillet over medium-high heat. Add liver and sauté until crisp and golden, about 3 minutes per side for medium. Transfer liver to plates. Add garlic to skillet; stir 30 seconds. Add broth and vinegar and boil 1 minute, scraping up browned bits. Season sauce with salt and pepper. Spoon sauce over liver; sprinkle with parsley.
Preparation Sprinkle liver with salt and pepper; dust with flour. Melt butter in heavy large skillet over medium-high heat. Add liver and sauté until crisp and golden, about 3 minutes per side for medium. Transfer liver to plates. Add garlic to skillet; stir 30 seconds. Add broth and vinegar and boil 1 minute, scraping up browned bits. Season sauce with salt and pepper. Spoon sauce over liver; sprinkle with parsley.