Slice entire pack of rolls in half. Set top slab aside. Place bottom half in a greased casserole dish.
Layer four slices of ham on top of the bottom slab. Then, top with cheese and the remaining ham slices.
In small bowl, combine mustard, mayonnaise, roasted garlic, coriander, paprika, pepper, salt, and lemon juice. Spread mustard mixture on remaining half of rolls and place on top of the ham layer.
Pour melted butter on top and sprinkle with poppy seeds.
Cover with aluminum foil and bake for 20 minutes, then uncovered 3-5 minutes.