In a medium size saucepan, heat the beans with the stock, hot sauce and cumin over medium-low, stirring until warm, about 10 minutes.
In a medium size bowl, combine half the onion and jalapeños with the lemon juice and garlic. Season with salt; let stand for 10 minutes. Mash in the avocados to make the guacamole.
In a small bowl, toss the remaining onion and jalapeños with the tomatoes and cilantro to make the salsa; season with salt.
Heat a large skillet over medium-high. Add one tortilla and cook until it starts to blister, about 1 minute per side. Repeat with the remaining tortillas. Place one tortilla on a work surface. Spread on a quarter of the cheese, some romaine, guacamole, salsa, sour cream and olives. Roll it up, burrito-style. Repeat with the remaining tortillas and fillings.
Cut the burritos in half; divide among plates.
This is one of many “Yum-o!” recipes – it’s good and good for you. To find out more about Yum-o!, Rachael’s nonprofit organization, visit