Peel the sausage and cut into small cubes. Cut the gherkins into small cubes. Wash parsley, dab dry and chop finely. Cut cress from the bed, put some aside for garnishing, chop the rest finely. Mix everything.
Peel onion and chop finely. Heat the oil and fry the onion in it. Deglaze with stock and vinegar, remove from heat. Pour broth over the salad. Season with salt and pepper. Cut cheese into small cubes and mix into the salad. Chill for 3-4 hours. Cut the lid off the tomatoes. Hollow out the tomatoes. Fill the lettuce into the tomatoes.
Cut cheese into small cubes and mix into the salad. Chill for 3-4 hours. Cut the lid off the tomatoes. Hollow out the tomatoes. Fill the lettuce into the tomatoes. Wash, clean and drain the lamb's lettuce. Arrange tomatoes with lamb's lettuce and cress aside