Leftover rice = burritos

The necessary parts:
1 to 2 cups cooked rice
1 can black beans (or pinto) - do not drain
salsa
tortilla

Nice additions:
1 chopped onion and a little oil
cilantro (1 Tbs dried or 2 Tbs fresh)
1 Tbs of lime juice
jalepenos from a jar
shredded cheese
guacamole
sour cream
lettuce

If you're using the onion, cook it in the oil until it softens.
Add the rice and can of beans to the pan and cook long enough to heat through. Add cilantro, lime, and jalepenos and turn off heat.

Put in the tortilla with your toppings. Wrap up. Eat.

These also keep really well in the fridge for a few days - just wrap the entire burrito in plastic wrap or tin foil. They can be reheated in the microwave if there isn't any lettuce on them or just eaten cold.