Place a large nonstick skillet coated with cooking spray over medium-high heat. Add sweet onion; cook 8 minutes, stirring occasionally. Remove the sweet onion from pan; place in a bowl. Recoat pan with cooking spray. Add broccoli; stir-fry 3 minutes. Add broccoli to sweet onion. Recoat pan with cooking spray. Add pork and red pepper; stir-fry 4 minutes or until pork loses its pink color. Reduce heat. Stir in the green onions, sugar, ginger, and garlic, and cook 30 seconds, stirring constantly. Stir in onion mixture, chicken broth, soy sauce, and cashews; cook 1 minute. Drizzle with sesame oil. Serve with rice.