Wash the tomato, dab dry, cut in half and remove seeds. Cut tomato into very fine cubes. Wash chives, dab dry and cut into fine rolls. Mix cream cheese and chives, up to 1 teaspoon for sprinkling. Cut the rind off the cheese and place the slices on a board. Spread the slices with cream cheese and sprinkle with tomato cubes, except for 1 tablespoon. Season with pepper and press the tomatoes lightly into the cream cheese with a knife.
Carefully roll up the cheese slices, wrap each one individually in cling film and chill for about 30 minutes. Cut the pumpernickel slices diagonally twice. Cut cheese rolls into 12 slices. Place one slice on each pumpernickel corner. Divide the snacks between 4 plates and sprinkle with the remaining diced tomatoes and chives. Serve garnished with parsley. Makes 12 snacks