How to Make It
Heat 2 tablespoons of the vegetable oil in a large frying pan over medium high heat. Add the sliced onions and cook, stirring occasionally, until the onions are soft and beginning to brown, about 8 minutes. Reduce the heat to medium, add the sugar and 1/4 teaspoon of salt and continue to cook until the onions have caramelized, about 15 minutes.
Meanwhile, add the quinoa and water to a small saucepan and bring to a boil over high heat. Reduce the heat to low and cook, covered, for 12 minutes. Remove from the heat and allow to cool.
In a large bowl mash the kidney beans with your hands, a fork or a potato masher. Mix in the cooked quinoa, grated cheddar, minced onion, garlic, chipotle powder, remaining salt and pepper. Form into 4 patties.
Heat the remaining 2 tablespoons of vegetable oil in a well-seasoned cast iron pan or non-stick pan over medium heat. Add the quinoa patties and give the pan a shake to make sure the patties don’t stick. Cook the patties for about 4 minutes, or until the patties are brown and crispy. Carefully flip the patties over and cook for 2 more minutes.
Divide the Gruyère cheese between the patties, cover the pan, and continue to cook for 1-2 minutes, or until the cheese has melted. Remove the pan from the heat.
If desired, butter both sides of each bun and toast for about 4 minutes in your oven at 350°.
Top each burger with caramelized onion and serve with all your favorite hamburger condiments.