Combine the soy sauce and cornstarch in a medium bowl, and add pork, stirring to coat. Cover and chill.
Place beans in a large saucepan of boiling water, and cook 5 minutes. Drain beans; plunge into ice water. Drain.
Heat oil in a large nonstick skillet coated with cooking spray over medium-high heat. Add ginger and garlic; sauté 1 minute. Add pork mixture; stir-fry 1 1/2 minutes. Stir in green beans; stir-fry 1 1/2 minutes or until pork is done. Stir in broth; reduce heat, and simmer 2 minutes. Serve over rice; sprinkle with cashews.