Calf's Liver with Bacon, Caramelized Onions and Sherry

INGREDIENTS

• 1 cup whole milk
• 1/2 teaspoon black pepper
• 8 bacon slices, cut into 1/2-inch pieces
• 1 teaspoon Essence, recipe follows
• 1 teaspoon salt
• 2 pounds calf's liver, cut into 6 pieces
• 1 cup dry sherry
• 1 tablespoon beef broth
• 3 tablespoons unsalted butter
• 3/4 cup all-purpose flour
• 2 large onions, thinly sliced