This recipe adds rich umami flavor to thinly sliced chicken thanks to a cornstarch slurry spiked with white miso. To finish the stir-fry, we add more miso plus fresh ginger, orange zest and juice; this mixture thickens lightly thanks to the starch and forms a savory-sweet glaze for the chicken and red onion. Steamed rice is the perfect accompaniment. Be sure to use white miso for this recipe, as it has a milder, more delicate taste than yellow or red miso.