1.Place noodles in large heatproof bowl, cover with boiling water, separate with fork, drain. Using scissors, cut noodles into 2cm pieces.
2.Combine lamb and half the sauce in medium bowl. Heat 1 tablespoon of the oil in wok, stir-fry lamb, in batches, until browned. Remove from wok.
3.Heat remaining oil in wok, stir-fry capsicum and celery until vegetables are tender. Add wombok, onion, garlic and ginger, stir-fry until wombok wilts. Return lamb to wok with noodles, vinegar and remaining sauce, stir-fry until hot. Remove from heat, stir in tomato, season to taste.