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1
In a large bowl, combine the spinach, Worcestershire, egg, and salt and pepper, to taste.
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2
With a whisk, mix the ingredients until egg is broken up and incorporated.
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3
Add the meat and with your hands, mix until thoroughly combined.
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4
Shape the meat mixture into 4 even patties, to fit the size of the kaiser roll, and put a 1/4-inch slight dimple in the middle of each patty to allow it to cook evenly.
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5
Heat the oil in a large skillet over medium-high heat.
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6
Alternately, heat a grill to medium (350 degrees F) and rub the grate with a towel dipped in oil.
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7
Heat the broiler on low heat.
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8
Add the patties to the skillet, and cook for about 4 to 6 minutes.
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9
Flip the burgers and cook another 4 to 6 minutes for medium-rare burgers.
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10
Alternately, grill the patties uncovered for 4 to 6 minutes, then flip and grill for another 4 to 6 minutes.
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11
Top each patty with a piece of cheese and put under the broiler to melt the cheese.
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12
Alternately, close the grill top, and cook until the cheese is melted.
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13
For the each burger, spread the bottom of the roll with 1/4 of the mayonnaise.
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14
Put the burger on the mayonnaise and top with 2 slices of the bacon and some of the onions.
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15
Cover with the top of the roll and serve.
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16
Quick-Pickled Onions:
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17
Combine all the ingredients, except the onions and bay leaf, in a medium saucepan over medium heat.
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18
Stir until the sugar is dissolved, and then bring to a boil.
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19
When the mixture comes to a boil, stir in the onion.
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20
Remove the pan from the heat and add the bay leaf.
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21
Let sit at room temperature until cool, at least 1 hour.
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22
Chili Mayo:
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23
Combine all the ingredients in a small bowl until evenly mixed.
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24
Cover and refrigerate until ready to use.
