Cook rice as directed on package, omitting margarine and salt.
Meanwhile, in small bowl, combine brown sugar, crushed red pepper flakes and soy sauce; mix well. Set aside.
In large nonstick skillet, heat oil over high heat until hot. Sprinkle pork strips with salt and pepper. Add pork strips to skillet; cook and stir 3 to 4 minutes or until pork begins to brown.
Reduce heat to medium-high. Add onion; cook and stir 2 to 3 minutes or until tender. Stir in soy sauce mixture; cook an additional 2 minutes. Serve immediately over rice.