Heat the oil in a saucepan over a medium-high heat. Add the scallions and ginger and saute for 2 minutes. Add the orange juice, chicken broth and vinegar and cook for 5 minutes, uncovered. Turn heat to low and stir in the miso paste and sesame oil. Stir until miso paste is dissolved, about 1 minute.
Pour the sauce over the snow or snap peas toss to coat and serve.