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1
Start the topping by bringing half of the butter to medium-high heat in a large saute pan or skillet (use one with a lid because youll need it in a few minutes).
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2
Add the onions and a generous pinch of salt.
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3
Yes, it looks like an obscene amount of onions, but they cook down quite a bit.
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4
Dont freak out.
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5
Cook the onions until they become soft, then reduce heat to medium-low, cover, and cook for about 30-35 minutes, stirring occasionally, until onions are golden brown and very, very soft.
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6
Add the remaining half of the butter, the sliced mushrooms, and the minced chipotle peppers.
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7
Cover and cook for another 10-12 minutes until the mushrooms are cooked and the onions are a deep caramel brown color.
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8
Taste the mixture.
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9
If you want it spicier, then add another chipotle or some hot sauce.
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10
While the onions are doing their thing, add the salt, black pepper, and Worcestershire to the ground beef, mixing gently with your fingers.
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11
Dont squish it in your hands or youll end up with mushy burgers.
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12
Divide meat into six sections and form wide, flat patties.
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13
(Or make them whatever thickness you prefer.
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14
I like my patties thinner.)
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15
Let the meat patties rest at room temperature while your grill or stove top grill pan heats up to medium-high heat.
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16
Once hot add the patties onto the grill/grill pan.
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17
Grill meat for about 8-12 minutes total, flipping once, until no longer pink inside.
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18
Plate the burgers.
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19
Top each with some of the onion-mushroom mixture and a few slices of avocado.
