Wash the meat and dab dry. Season with salt and pepper and place in a greased flat roaster. Roast in a preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) 1 1⁄4-1 1⁄2 for hours.
Cover with bacon about 30 minutes before the end of the frying time (if necessary, pin the ends with wooden skewers so that the bacon does not shrink).
Wash the tomatoes and cut them into pieces. Wash and chop the basil. Peel onion and garlic and chop finely. Mix everything with vinegar, oil and ketchup. Season salsa to taste with salt and pepper.
Wash, coarsely chop and fold in the arugula.
Pull the skewers out of the meat. Let roast rest for a short time, cut into slices. Serve with the salsa. Serve with baguette or new potatoes.