Heat canola oil in a large nonstick skillet over medium-high heat. Add ginger, lemongrass, and garlic; sauté 1 minute or just until mixture begins to brown. Add chicken; sauté 2 minutes. Add edamame and stir-fry mix; sauté 3 minutes. Combine soy sauce, mirin, sesame oil, and cornstarch, stirring with a whisk. Add to pan; cook 1 minute. Remove from heat. Stir in onions, sesame seeds, and salt. Serve over rice.