Wash the potatoes and cook in boiling water for about 15 minutes. Drain, rinse with cold water and peel, let cool off. Wash the asparagus, cut off the lower woody ends. Peel the white asparagus. Cut asparagus spears into pieces. Cook in boiling salted water for 5-6 minutes. Drain and chill in cold water. Wash and clean spring onions and cut into fine rings. Wash and halve the tomatoes
Halve the potatoes and pluck the ham into pieces. Mix both in a bowl with 4 tablespoons of oil. Distribute on a baking tray. Roast in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for 20-25 minutes until golden brown. In the meantime, soak rolls in cold water. Wash the herbs and dab dry. Pluck off leaves and chop finely, except for a little basil for garnishing. Peel onion and chop finely. Knead the minced onion well with about half of the parsley, squeezed bread roll, mustard and egg. Season with 1 tsp salt and pepper. Form approx. 12 meatballs from the minced meat mixture
Take out the potatoes and ham, put the ham aside. Heat 350 ml of water in a saucepan, dissolve stock in it. Let it cool down a little. Stir in vinegar, lemon juice, 3 tablespoons of oil and half of the lemon peel. Season to taste with salt, pepper and sugar. Pour hot stock over the potatoes and let it steep a little. Heat 2 tablespoons of oil in a frying pan. Fry the meatballs in portions on each side. Remove and place on a baking tray. Cook the meatballs in a hot oven (electric cooker: 150 °C/ circulating air: 125 °C/ gas: see manufacturer) for approx. 15 minutes
Roast the almonds in a pan without fat, take them out and let them cool down. Finely chop the almonds. Mix remaining chopped herbs and lemon peel with almonds and 4 tbsp. oil. Season with salt and pepper. Drain mozzarella and cut into slices. Spread the mozzarella over the meatballs and melt in a hot oven for about 5 minutes. Mix prepared salad ingredients into the potatoes. Season to taste once again. Drizzle herb oil on the meatballs and serve. Garnish with basil