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In batches, pulse mushrooms in a food processor, scraping down the perimeters as soon as or twice, till finely chopped.
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Warmth 2 tablespoons oil in a successfully-organized pot over medium-excessive warmth. Add the mushrooms and cook dinner, stirring infrequently, till browned and the liquid has evaporated, 5 to 7 minutes. Add 4 tablespoons vinegar, 2 teaspoons paprika and garlic powder. Cook dinner, stirring, for 3 minutes. Scrape into a successfully-organized bowl and unfold into a skinny layer. Let cool for 10 minutes.
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In the intervening time, combine the final 1 tablespoon vinegar, 1/8 teaspoon salt and sugar in a microscopic bowl. Add cucumbers and toss to combine. Combine mayonnaise, tomato paste and the final 1/2 teaspoon paprika in a microscopic bowl. Dwelling the cucumbers and aioli apart.
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Preheat grill to medium-excessive.
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Add crimson meat and the final 1/2 teaspoon salt to the mushrooms. Mix successfully. Maintain into 8 equal patties, about 4 inches in diameter. Toss peppers with the final 1 tablespoon oil in a medium bowl. Switch to a grill basket.
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Oil the grill rack. Grill the burgers, flipping as soon as, till an instant-read thermometer inserted in the thickest fragment registers 155 levels F, 8 to 10 minutes complete. Grill the peppers, stirring infrequently, till browned, 5 to eight minutes complete.
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Prime the burgers with cheese and cook dinner till melted, 1 to 2 minutes more. Help the burgers on buns with greens, onion, tomato, the peppers, cucumbers and aioli.
Pointers
Food regimen bonus: Vitamin B12 & Vitamin C (42% daily worth), Iron (33% dv).