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1
Heat 1 teaspoon oil in a skillet over medium-high heat.
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2
Add onions and 1/2 teaspoon salt to skillet.
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3
Reduce heat to medium low, stirring occasionally until onions are well browned.
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4
This process takes about 15-20 minutes be patient, its worth the wait!
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5
When the onions start to sizzle add about 1 tablespoon water to skillet and stir.
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6
Continue cooking until the water evaporates and onions start sizzling again.
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7
Repeat this process until your onions are nice and brown.
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8
Remove from pan and set aside.
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9
You can make the spread while your onions are doing their thing.
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10
Combine mayonnaise, ketchup, relish, sugar, and vinegar in small bowl.
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11
Stir to combine and set aside.
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12
Form your patties using a 1/4 cup scoop.
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13
Flatten to about 1/2 and then make a thumb print in the middle so they stay flat while cooking.
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14
Season generously with salt and pepper.
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15
Add remaining 1/2 teaspoon oil to pan, swirl to coat, and heat over medium-high heat until lightly smoking.
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16
Add burger patties and cook without moving until well browned and crusty on first side, about 3 1/2 minutes.
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17
While patties are cooking, spread 1 teaspoon of yellow mustard on the raw side of each patty with a spoon.
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18
Flip patties with a thin spatula so mustard side is down and continue to cook for 1 1/2 minutes.
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19
Top each patty with a slice of cheese (1 quarter of an American cheese slice) spoon about a teaspoon of the onion mixture over the cooked patties.
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20
Prep each bottom bun with spread (I actually put spread on the top and bottom bun but do what you like), one pickle slice, 1 slice of tomato, and lettuce.
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21
Place the patty on the bottom bun.
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22
Top with top bun, and serve immediately!
