You'll want to allow this melty Pastrami and Swiss on Pretzel Rolls time to "set" so your filling doesn't spill out of the bread.
Spread cut sides of pretzel rolls evenly with mustard. Layer 4 roll halves each with 1 cheese slice, 2 ounces pastrami, and a second cheese slice. Top with remaining 4 roll halves.
Spread outside of sandwiches with softened butter. Cook in a nonstick skillet over medium heat, in batches, 2 minutes on each side or until cheese melts and bread is golden brown.
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