2	tbsp	Mayonnaise
1	tbsp	Prepared horseradish
1	tbsp	Prepared mustard
1	tbsp	Onion, chopped
8	slices	Rye bread
4	slices	Swiss cheese
8	slices	Cooked ham

Combine mayonnaise, mustard, horseradish and onion in a small bowl and mix well. Spread on four slices of bread. Layer with ham and cheese and top with remaining bread.