Peel and chop the onion. Peel, wash and roughly dice the potatoes and celery. Peel 2 apples, quarter them, remove seeds and cut them into pieces.
Heat the oil in a pot. Fry onion, potatoes, celery and apples in it. Season with salt and pepper. Deglaze with 3⁄4 l water and milk. Bring to the boil and stir in the stock. Cover and cook for about 20 minutes.
Meanwhile wash parsley, shake dry and chop finely. Wash 1 apple, cut into quarters, remove seeds and dice finely. Puree the soup finely. Stir in crème fraîche and season to taste with salt and pepper. Serve the soup and sprinkle with apple and parsley. Serve with pig's ears.
Let the puff pastry rest for about 10 minutes at room temperature. Finely dice the tomatoes. Unroll dough together with baking paper. Spread the ground pork in flakes and the tomatoes on top. Season with a little salt and pepper. Roll the dough from both long sides towards the middle and cut it into approx. 24 slices. Place on a baking tray covered with baking paper.
Whisk the egg yolk and 2 tablespoons of water. Brush the auricles with it. Bake in the preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer) for approx. 15 minutes. Take out and let cool down.
Preparation time: 50 min. 80 kcal (5 g carbohydrates, 3 g protein, 5 g fat) per piece