Add the butter and beat vigorously with a wooden spoon, mashing the cheese and butter together against the sides of the bowl until the mixture is light and fluffy.
Beat in the chives, fennel, chopped parsley, paprika, and caraway seeds.
Mound the cheese-herb mixture in the center of a platter and arrange the tomatoes, olives, parsley sprigs, radishes, and scallions attractively around it.
Serve at room temperature with rye or pumpernickel bread
Spread 4 slices bread with butter. Place in bottom of greased 8-inch square baking dish. Toast lightly in oven (350° F) about 10 minutes. While bread is toasting, brown bacon, onion, celery and green pepper. Season with salt. Place 4 slices cheese on each of 4 toast slices in baking dish. Arrange bacon mixture over cheese. Place a tomato slice on each sandwich. Top with remaining cheese slices. Cover with remaining bread slices. Combine eggs, milk and mustard, mixing well. Pour over sandwiches. Bake in moderate oven (350° F) about 40 minutes.