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1
Preheat grill pan or large nonstick skillet.
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2
Saute onions in a small pan over moderate heat for 3 to 5 minutes until tender.
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3
Combine meat with Worcestershire sauce, Sauteed onion and steak seasoning blend or salt and pepper.
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4
Form 4 large patties.
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5
Drizzle patties with a touch of extra-virgin olive oil.
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6
Quick toast your split rolls, then add burgers to grill pan or skillet.
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7
Grill or pan-fry burgers 4 to 5 minutes on each side for medium well doneness.
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8
Heat a small to medium nonstick skillet over medium high heat.
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9
Add a little oil and mushrooms.
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10
Season mushrooms with a little salt and pepper and saute until just tender, about 3 to 5 minutes.
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11
Remove from heat.
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12
Pile mushrooms on top of burgers just before you are ready to take them off the grill or out of the pan.
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13
Fold each Swiss cheese slice in half and rest on top of mushrooms.
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14
Place a loose tin foil tent over the burgers and turn heat off under pan or grill.
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15
Allow the cheese to begin to melt down over mushroom and burgers, about 2 to 3 minutes.
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16
Combine balsamic, mayonnaise and coarse cracked black pepper in a small dish.
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17
To assemble, place burgers with mushrooms and Swiss cheese on bun bottom.
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18
Slather tops of buns with Balsamic black pepper mayonnaise and baby spinach.
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19
Set burger tops in place and serve with sliced vine ripe tomatoes, drizzled with oil, seasoned with salt and pepper and garnished with scallions.