PLACE pork in large bowl. Add combined marmalade, horseradish sauce and dressing mix; toss to coat.
HEAT oil in large nonstick skillet on medium-high heat. Add pork mixture; cook and stir 10 to 15 minutes or until pork is evenly browned. Reduce heat to medium-low.
ADD snow peas and water chestnuts; mix lightly. Cover; cook an additional 5 to 7 minutes or until peas are crisp-tender, stirring occasionally. Serve over hot rice.