Add the rice to a medium saucepan and rinse 2 or 3 times under water, until the drained water runs clear. Once drained, add 2 1/2 cups warm water and bring to a boil. Add the lime zest, lime juice and chicken stock powder, and give it one quick stir. Allow the rice to boil, uncovered until all the moisture has evaporated, about 15 minutes. Note: do not stir the rice while it's cooking. Also, while the rice cooks, start preparing the chicken.