Sort the spinach, wash and shake dry. Coarsely grate the cheese. Knead the minced meat, egg, mustard and breadcrumbs well and season with 1 1⁄2 tsp salt and 1 tsp pepper. Form a rectangle (approx. 25 x 35 cm) on a piece of foil. Spread Parma ham, spinach and cheese on top. Roll up from the short side to a firm strudel and place on a baking tray.
Preheat oven (electric cooker: 200 °C/circulating air: 180 °C/gas: see manufacturer). Wash the potatoes thoroughly, cut into large pieces and mix with 2 tbsp. oil. Season with salt and paprika. Spread the potatoes around the chopped strudel. Bake in a hot oven for about 50 minutes.
Peel and finely dice the onion and garlic. Heat 1 tablespoon of oil in a saucepan. Sauté onion and garlic in it. Add tomatoes, bring to the boil and simmer for about 10 minutes. Season to taste with salt, pepper and 1 tsp. sugar. Wash parsley, shake dry, chop leaves finely. Arrange everything and sprinkle with parsley.