Sautéed red deer á la Rydberg

Ingredients

• 1 packet of Lapin Liha’s sautéed red deer
• 6 potatoes
• 1 yellow onion thinly sliced
• 2 tbsp butter
• 1 tbsp chopped parsley
• 2 whole canned beetroots
• 1 tbsp grated horseradish
• salt
• black pepper