Foie de veau a la berlinoise

Ingredients

• 1/2 cup of bacon, cut into batons
• 1 red onion, halved and thinly sliced
• 3 apples, cored and cut into eighths
• 4 tbsp butter
• 1/4 cup balsamic vinegar
• 1/4 cup white wine
• 1 lb calf?s liver, cut into strips
• Salt and pepper
• Flour
• 2 tbsp parsley, chopped