This is a great way to use leftover quinoa from dinner, and is easy to pack up and take for lunch. It doubles (or triples) easily if you want to make enough for the week.
Make sure you have the quinoa cooked first, by putting 1 cup dry in a pot with 2 cups water and a pinch of salt. Bring to a boil, then turn down to low and leave to simmer, covered, until soft and fluffy - about 20-25 minutes.