INGREDIENTS
cooking spray (such as Crisco®)
1/2 cup
butter
1
onion, minced
3 tbsp
Dijon mustard
1 tbsp
poppy seeds
2 tsp
Worcestershire sauce, or more to taste
1
(12 count) package Hawaiian sweet rolls, split, or more as needed
1 lb
sliced deli ham, or more as needed
8
slices Swiss cheese, or more as needed