Wash, clean and halve the tomatoes. Hollow out tomato halves. Finely dice the inside of the tomatoes. Wash parsley, dab dry, pluck leaves from the stalks and chop finely. Fold the parsley and tomato interior into the cream cheese, except for a little bit for sprinkling. Fill 4 tomato halves with the cream cheese mixture and garnish with the remaining parsley and tomato pieces.
Drain the tuna. Peel and finely chop the onion. Chop the tuna and mix it with onions and vinegar. Season with salt and pepper. Fill the remaining tomato halves with it and arrange on salad leaves as desired. Goes well with crackers