Step 1: Mix pepper and mayonnaise.
Step 2: Set aside.
Step 3: Dry toast bun.
Step 4: Set aside.
Step 5: Heat butter add mushrooms and onion and cook until softened.
Step 6: Meanwhile, form meat into patty, season to taste add next to onion mushroom mixture.
Step 7: Add mayonnaise mixture to top and bottom bun.
Step 8: On top bun put on lettuce then tomatoes.
Step 9: On bottom bun put 1 slice of Swiss cheese.
Step 10: Flip burger.
Step 11: Add slice of cheese.
Step 12: Cook to your doneness.
Step 13: On bottom bun put mushroom mixture on top of cheese.
Step 14: Put burger on, and put top bun on.
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