Step 1

Set oven to broil and allow to preheat.

Step 2

Slice the rolls in half and line the bottom half in the bottom of an oven safe dish.

Step 3

Next, top with corned beef, cheese and sauerkraut.

Step 4

Place the dish in the oven under the broiler for about 3-5 minutes until the cheese starts to melt; then remove from the oven and lower oven to 350 degrees F.

Step 5

Next, add the mustard to the top half of each roll and place on top of the sandwiches.

Step 6

Melt the butter in a small saucepan on top of the stove and add poppy seeds; then brush on top of the buns.

Step 7

Bake for another 8-10 minutes until the cheese has melted and the tops are lightly browned.