In a small bowl, dissolve the cornstarch in 1 tablespoon of the soy-sauce. Stir in the remaining soy sauce, the broth, orange juice, sherry, orange zest, and sesame oil. Heat the vegetable oil in a stir-fry pan or large skillet over medium-high to high heat. Add the ginger, garlic, scallions, and chile paste and stir-fry until fragrant, about 30 seconds. Add the vegetables and stir-fry until crisp-tender (if you're using some long-cooking vegetables like broccoli, add them before shorter cooking ones to give them a head start). Add the meat or seafood and stir-fry until just cooked through and the vegetables are tender. Stir the sauce mixture and pour it into the pan. Bring to a boil just to thicken. Serve the stir-fry over rice.