Heat the oven to 205 c Line two rimmed baking sheets with foil and parchment paper
Using a damp paper towel, brush all dirt from mushrooms. Dice the mushrooms, carrot, broccoli and onion into 1/2-inch chunks. Toss vegetables into the bowl of a food processor. Add the garlic, olive oil, smoked paprika, chili powder, salt and pepper. Close the lid and pulse 10 to 20 times until coarsely ground.
Spread the ground vegetables onto one of the lined baking sheets. Pat them down with a spatula until a very thin layer of vegetables covers the majority of the baking sheet. Roast the vegetables for 15 minutes. (If the veggies around the outer edges start to turn dark brown, stir and press them back down into a thin layer).Spreading the Vegetables
Meanwhile, spread the drained black beans onto the second baking sheet in one layer. When the vegetables have roasted for 15 minutes, stir them and press into a thin layer once more. Transfer both baking sheets (vegetables and the black beans) to the oven. Roast until the beans begin to split and look dry and the vegetables look drier and toasted, about 15 minutes. Let everything cool.
While the beans and vegetables roast, rinse the food processor bowl and pat dry.
Place the walnuts, spinach and fresh herbs in it. Pulse until they are about the size of breadcrumbs.
Add cooled beans and pulse 5 to 10 times until the beans look crumbly with large crumbs.
Add the roasted vegetables, panko breadcrumbs, eggs and the tomato paste. Pulse until everything is just combined. You want to keep some texture, don’t pulse until a smooth mixture.
Scrape the mixture into a bowl and fold in the rice.
Refrigerate the veggie burger mix up to 24 hours. Or make patties, cook them and freeze wrapped in foil up to 3 months.
When you are ready to make the burgers.
Heat a skillet over medium-low heat, add oil, and then place patties in one layer. Cook until heated through, firm and browned on both sides.
Wrap in lettuce leaf with tomato, cheese and favorite burger sauce
To reheat frozen cooked burgers:reheat in a skillet over medium-low heat until heated through. We do not recommend microwaving the patties (they steam and become floppy).
