In a large nonstick skillet, heat oil over medium-high heat. Add pork cubes and onion; cook and stir 3-4 minutes or until pork is nicely browned and onion is tender; set aside.
Make dressing by shaking together orange juice, vinegar, salt, pepper and orange zest in a small jar with tight-fitting lid. In a large serving bowl, toss together the pork and onion, pasta, broccoli, cherries and walnuts with the dressing. Serve immediately.
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