- In a saucepan, bring all the ingredients except the butter to a boil. Reduce the heat and simmer for 20 minutes over medium heat or until the broth thickens. Remove from the heat and whisk in the butter. Adjust the seasoning. Keep warm.
- Preheat the grill, setting the burners to high. Brush the apples with the oil. Season with salt and pepper. Grill the slices of apples for about 3 minutes on each side. Grill the slices of liver for 1 to 2 minutes per side or until it is pink on the inside. Season with salt and pepper.
- Divide the mesclun among 4 plates and top with the liver. Garnish with apple slices and drizzle with the warm dressing.