MIX dressing, sugar and soy sauce until blended. Heat 1-1/2 tsp. oil in large skillet on medium-high heat. Add 1/3 of the meat; cook 1 to 2 min. or until lightly browned, stirring frequently. Transfer to medium bowl. Repeat in 2 batches with remaining meat and 1 Tbsp. of the remaining oil.
HEAT remaining oil in same skillet. Add potatoes and onions; cook 15 min. or until potatoes are tender, stirring occasionally. Return meat to skillet. Add chiles and garlic. Stir in dressing mixture; cook 3 min. or until heated through, stirring occasionally.
TOP with nuts and cilantro. Serve with rice.