Place in broiler for 2 minutes; place top buns along side, but with no butter; remove when slightly brown and set aside
Place ½ teaspoon butter in skillet on medium low heat; add caraway seeds and heat for about 3 minutes (until you can smell them toasting)
Add sauerkraut to skillet on low heat; toss and simmer until caraway seeds are well combined into sauerkraut; slide sauerkraut to one side of the skillet
Add pastrami to the other side of the skillet; turn the heat up to medium, tossing pastrami until it is heated thoroughly
Layer bottom buttered buns with dressing, pastrami, sauerkraut, and cheese; return to broiler until cheese has melted
Place top bun on sandwich and enjoy!
Notes
Lightly butter buns and place under broiler for a few seconds; this helps keep the sandwich from falling apart when you add the fixings
Return assembled sandwich to broiler after you add the cheese