Peel, wash and dice the potatoes. Cook in boiling salted water for about 15 minutes, drain and let cool off. Wash and halve the tomatoes. Cut cheese into cubes. Peel onion and cut into thin rings. Wash parsley, shake dry and chop finely.
Beat oil and vinegar, season with salt and pepper. Mix potatoes, tomatoes, cheese, onion, parsley and olives with the vinaigrette. Leave to steep for about 30 minutes. Clean and wash the romaine lettuce and pluck into bite-sized pieces. Fold into the salad and serve
Waiting time approx. 30 minutes