1 hamburger bun
1 slice ham
1 slice Swiss cheese
butter
brown sugar
mustard
poppy seeds
finely chopped onions

Butter the bun on bottom half. Sprinkle desired amount of brown sugar over the buttered bun, then top with a slice of ham and Swiss cheese. Spread mustard on top half of bun. Sprinkle poppy seeds on the mustard and onions. Close sandwich and wrap in tinfoil.

Bake at 350°F for around 15 to 20 minutes or until heated through.