Clean the salad, wash and shake dry. Pluck leaves into bite-sized pieces. Wash and quarter tomatoes. Mix vinegar, mustard, salt and pepper. Fold in 5 tablespoons of oil. Wash the rosemary and dab dry.
Peel the garlic and cut into fine slices. Peel, wash and finely dice potatoes.
Preheat oven (electric cooker: 150 °C/circulating air: 125 °C/gas: see manufacturer). Coat a baking tray with oil. Dab meat dry. Heat 1 tablespoon of oil in a large pan. Fry the meat in it thoroughly for approx. 3 minutes.
Finally fry garlic and rosemary briefly. Remove and place on a baking tray. Season meat with salt and pepper. Roast in the hot oven for about 5 minutes.
In the meantime heat 1-2 tbsp. oil in a frying pan. Fry the potatoes for about 10 minutes, turning them until golden brown. Season with salt and pepper. Mix salad, tomatoes and vinaigrette. Cut meat into large pieces.
Arrange salad with meat and potato croutons.