Step 1: Mix 1 tablespoon butter with the parmesan cheese and smear on the sour dough bread.
Step 2: Form beef patty to bread size and season.
Step 3: Grill.
Step 4: Put onion with butter and grill with patty until browned.
Step 5: Add cheese and let melt.
Step 6: Top with onions,
Step 7: Meanwhile, in another skillet grill the bread.
Step 8: On inside, add mustard to taste.
Step 9: Grill until cheese is crusty.
Step 10: Add tomato on one side, burger on the other.
Step 11: Put together and cut in half.
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