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1
To prepare the marmalade (I only made 1/2 recipe and it was enough):
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2
Melt butter in large saute pan over medium high heat. Add onions and saute until they begin to soften, about 5 minutes.
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3
Reduce heat to low and continue cooking until onions are tender, about 12 minutes.
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4
Sprinkle sugar over onions. Add wine and vinegar and bring to a simmer.
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5
Simmer until liquid evaporates and mixture becomes slightly syrupy, about 15 minutes. Season marmalade to taste with salt and pepper. Keep warm until serving.
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6
Meanwhile, make the quick aioli (I only used half of this to generously garnish 4 burgers):
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7
Whisk mayonnaise, lemon juice, mustard, and garlic in small bowl to blend. Season to taste with salt and pepper.
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8
To prepare the burgers (Note: I cooked on broiler pan in oven at 500-degrees, original directions below).
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9
Prepare the BBQ for medium high heat.
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10
Form seasoned ground beef into four 6-oz patties on baking sheet lined with waxed paper. Flatten patties so they are slightly larger than diameter of buns.
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11
Drizzle patties with a little oil and sprinkle with salt and pepper.
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12
Grill patties, oiled-side-down, until browned on bottom, about 3 minutes. Turn patties over and top with cheese, cook 3-4 minutes longer for medium-rare doneness. If necessary, close grill to help melt cheese.
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13
Brush cut sides of buns lightly with olive oil and grill, oiled-side-down, until lightly toasted with grill marks, about 1 minute.
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14
Remove buns and burgers from grill and allow burgers to rest for 3 minutes.
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15
Spread aiolo over bun bottoms. Mound arugula over bun bottoms.
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16
Place burgers atop of arugula. Top with generous amount of marmalade and then bun tops. Serve immediately.