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1
PATTIES.
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2
Pass beef through meat grinder fitted with 1/4-inch plate twice. Form into 2 even balls and flatten into 4-inch patties using wet hands against a cutting board.
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3
Scrape patties up with thin spatula and place on a sheet of parchment paper. Refrigerate until ready to use.
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4
Place the 1/4 cup minced onion on a double layer of paper towels on a microwave-safe plate and microwave for 10 minutes on LOW power (setting 1 or 2) until mostly dehydrated, but not browned. Set aside.
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5
SAUCE.
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6
While onion is dehydrating, combine grated onion, mayonnaise, relish, mustard, sugar, marmite and turmeric. Stir to combine and refrigerate until ready to use.
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7
BUNS.
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8
Preheat toaster oven or broiler to high.
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9
Use one finger to spread a very thin layer of egg white over the top of the top bun. Sprinkle with sesame seeds and place under the broiler for 30 seconds until set. Set aside.
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10
Use a sharp, thin knife to cut off the very bottom of the bottom bun half, creating a single circular piece of bread with cut surfaces on both sides.
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11
Toast cut side of top bun and bottom bun, and one side of center bun piece under broiler until light golden brown.
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12
BEGIN ASSEMBLY AND COOK PATTIES.
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13
Place bottom bun and center bun on cutting board toasted-side up.
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14
Spread half of sauce on each.
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15
Divide dehydrated onions evenly between bottom and center buns and top with lettuce. Place 2 pickle slices on each.
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16
Season burger patties with salt and pepper, to taste.
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17
Heat a heavy-bottomed 10-inch stainless steel or cast iron skillet over high heat until lightly smoking.
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18
Add patties and cook WITHOUT MOVING until first side is crusty and browned, about 1 minute.
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19
Scrape up patties with a stiff spatula and flip.
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20
Top 1 patty with 1 slice cheese.
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21
Continue cooking until cooked through, about 1 minute longer.
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22
Transfer cheese-topped patty to bottom bun and cheeseless patty to middle bun.
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23
Place top bun on top of center, then stack center bun on top of bottom.
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24
Serve immediately.