Preheat the oven to 350F (177C)
Coarsely chop the chickpeas, walnuts and lentils in a food processor. Be careful not to overchop. Add them to a medium-size pan. If you are using oil, sauté the bean mixture over medium-low heat with a drizzle of oil until it’s coated, about 1 to 2 minutes.
Add the broth, tomato sauce, hot sauce, salt and pepper. Cook partially covered over medium-low heat for about 20 to 25 minutes until the beans are cooked and the liquid has mostly evaporated. Watch closely, stirring frequently, and lower the heat if it begins to stick, which can happen if you are not using oil.
Uncover when most of the liquid has evaporated, and continue to cook, stirring frequently until the liquid is almost gone. Set the pan aside to cool.
Fill tortillas in the center with the meaty bean/nut mixture, lettuce, tomatoes, red onion and hot sauce, if using. Simply fold the burrito by folding the sides over toward the center and secure them with a toothpick, blue for mild and red for spicy. See complete instructions on page 15. Place them on a parchment-lined cookie sheet and bake for about 20 minutes or until they’re crisp. Serve immediately.