Arrange cucumber slices o plate. Sprinkle vinegar and salt over. Let mixture
stand for 30 minutes. Drain cucumbers and pat dry. Light butter one side of
each bread slice. Overlap cucumbers in 2 layers atop 12 bread slices. Sprinkle
green onion over. season with pepper. Top each with slice of buttered bread,
buttered side down. Cut sandwiches into rounds using 1 1/2 inch round cookie
cutter