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1
Heat oil in a skillet (use one that has a lidyoull need it later) over medium heat then add onions.
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2
Add onions, stir to coat the onions with the oil then put the lid on.
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3
Cook onions for 30 minutes or until onions begin to turn golden brown and caramelize.
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4
Watch them so they dont burn.
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5
After 30 minutes, remove lid and cook for 5 more minutes.
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6
Then add 1/2 cup of water.
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7
Allow water to evaporate.
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8
Then remove the pan from the heat and set aside.
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9
Onions can be made several days ahead of time and refrigerated.
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10
Mix together the mayo, ketchup, relish and vinegar in a bowl and set aside.
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11
Form meat into 8 patties about 4 inches wide and 1/2 inch thick.
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12
Set them aside for a moment.
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13
Heat a griddle to medium-high heat and lightly brush the griddle with vegetable oil.
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14
Toast the buns on the griddle, split side down.
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15
After they are toasted golden brown, remove them from the griddle and spread the bottom bun with 1 tablespoon of the mayo mixture.
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16
Set the buns on plates or a platter.
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17
Add the tomato and lettuce to the bottom bun.
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18
Salt and pepper both sides of the hamburger patties and cook on the griddle for 3-5 minutes.
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19
Spread top of patty with 1 1/2 teaspoon of mustard and flip.
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20
Top each patty with cheese and allow to cook until done to your liking.
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21
Another 5 minutes should give you medium rare.
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22
Add hamburger to the bun and top with caramelized onions, pickles and the top bun.
