Add the beans and salsa to a saucepan and warm through for 3–4 minutes over medium heat. Roughly mash about half the beans with the back of a fork.

Wrap tortillas in foil and warm in the oven, or warm them in a sandwich press, or without foil in the microwave for a few seconds.

Lay tortillas out on a plate and fill evenly with roast beef, bean mix, carrots, tomato, lettuce, avocado and cheese. Wrap up and serve the burritos alongside any leftover salad.