German Recipe for Baked Fish with Horseradish Sauce

Ingredients (8)

• 1 1/2 pounds sole filet (or flounder; fresh or thawed)
• 2 tablespoons vinegar (or lemon juice)
• 1 tablespoon butter (melted)
• 4 tablespoons horseradish (freshly grated; or 3-4 tablespoons bottled or to taste)
• 1 apple (tart, grated)
• 3/4 cup sour cream
• salt to taste
• Optional: sugar to taste