My mother-in-law was known for making these Hot Ham and Cheese Sandwiches. She made them whenever her church was having a rummage sale and she needed to help feed the volunteers. This is a perfect make ahead recipe and I often make these whenever there is a great sale on deli ham. Not only can they be made ahead, but they can also be frozen. I've made these when I've had company staying for the weekend at our house. I've made them when we were moving into a new house I knew I wouldn't have the time, energy or materials to make a meal. They also travel well. I made them to help feed family who were helping an elderly Aunt move into a new apartment. These sandwiches aren't fancy, but they offer a compact and easy meal. My mother-in-law added a lot more Worcestershire than I've included in this recipe, but I've found that kids prefer them with the amount that I've specified.
6 Tablespoons salted butter, softened
2 teaspoons finely diced onions
1 teaspoon poppy seeds
1/2 teaspoon dry mustard
2 teaspoons Worcestershire sauce (or more if desired)
8 hamburger buns or kaiser rolls
1 pound thinly sliced, or shaved ham (I use shaved)
8 slices Swiss or Munster cheese (a little over .5#)
8 pieces of foil, each about 16" long
In a small mixing bowl, combine the softened butter, onions, poppy seeds, dry mustard and Worcestershire sauce. I find it faster to use an assembly line method to put these sandwiches together. To do so, line up the foil, side by side, on a counter. On each piece of foil, place an opened hamburger bun. Spread a generous 1/2 teaspoon of the butter mixture on the inside of both the top and bottom of each bun. Place approximately 1/8 of the ham on the bottom of each bun. Top with a slice of cheese and the top portion of the bun. Wrap the foil around each sandwich.
Bake at 350°F for 20 minutes. When baking you can place the foil packets directly on the oven rack. You can refrigerate or freeze these foil wrapped sandwiches after placing them in a zip style bag.