Make the beans: In a medium bowl, stir together the black beans, lime juice, taco seasoning, olive oil, and salt. Set aside to marinate while you prepare the other components.

Make the peppers: Heat the olive oil in a large skillet over medium heat. Add the peppers, a pinch of salt, and several grinds of pepper. Cook, stirring occasionally, for 8 to 10 minutes, or until the peppers are soft and browned in places. Remove from the heat and season to taste.

Assemble the burritos: Fill the centers of the tortillas with a layer of spinach, a scoop of rice, some of the beans, the peppers, guacamole, pickled red onions, cilantro, and jalapeños. Tuck and roll closed. Serve with salsa.