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1
In a medium pot, combine the quinoa with 1 cup of water. Add a pinch of salt. Bring to a boil, turn heat to low, cover, and cook until tender, about 20 minutes. Remove from heat, and let stand covered. You should have about 1 1/2 cups.
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2
Meanwhile, place a large saute pan over medium-high heat. Add a tablespoon of oil. When it shimmers, add the shallots or onion and a pinch of red pepper flakes. Turn the heat down to medium, and cook until the shallots soften, about 2 minutes.
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3
Meanwhile, run the mushrooms down the chute of a food processor fitted with the shredder attachment. Run the sweet potato wedges down the chute next. (If you don't have a food processor, shred the sweet potato using a cheese grater and finely mince the mushrooms.) Dump the mushrooms and sweet potatoes into the pan with the shallots. Turn the heat up to medium-high and cook until the vegetables are just soft, about 2 minutes more. Season with salt to taste. Transfer to a large bowl. Add the cooked quinoa, panko, parsley, and Parmigiano Reggiano. Stir to combine. Taste. This is your chance to get the seasoning right. If it needs more salt and pepper, and them now. Add the eggs, and stir to combine.
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4
Make a test patty: Place a large skillet over high heat. Add oil to coat the bottom in a thin layer. Scoop out some of the quinoa mix with your and cup it to form a ball. Gently flatten to form a patty. When the oil shimmers, carefully lower the patty, season with salt and pepper, cook 2 minutes, or until underside is deeply golden brown, flip, cook 2 minutes more. Remove from skillet. Let cool briefly. Taste, make adjustments to your vegetable mix accordingly - if the patty fell apart, add another egg. If it feels too wet, add more panko. Adjust seasoning with more salt and pepper if necessary.
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5
When ready to cook, form patties using a 1/3 cup measuring cup. Scoop out the mix, squeeze with your hands, form into a ball, then pat to form into a patty-mixture will be delicate/wet. Portion out all of the mixture. Return the skillet to medium-high heat. Add more oil if necessary - there should be a thin layer. Carefully lower patties into the oil and cook two to three minutes a side or until each side has formed a nice, golden-brown crust. It's best to let the patties cook undisturbed for a minute or two before peeking to check for doneness-you want to give them a chance to develop a crust.
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6
Serve with buns, mashed avocados, lettuce, and pickled onions if you wish.
