INGREDIENTS
16 tbsp
unsalted butter, softened, divided
3 tbsp
poppy seeds, plus more for garnish
1 tsp
Worcestershire Sauce
3 tbsp
prepared yellow mustard
1 cup
sweet onion, minced
1 lb
sweet boneless cooked ham, minced
16 oz
Swiss cheese, shredded, divided
36
large dinner rolls (like King's Hawaiian Sweet Rolls)