The day before, cook rice in plenty of lightly salted boiling water until just tender. Then drain, rinse under cold water and drain again. Refrigerate overnight.
Heat a little oil in a wok (or non-stick pan) and briefly stirfry celery and carrots.
Then add small handfuls of the rice, one at a time, ensuring the grains are separated, continually stirring.
Add chicken, peas and soy to taste, and briefly stirfry.