Put leftover rice in a large bowl, add chopped celery, garlic, lemon grass, red curry paste, boiled vegetables,salt, pepper powder and cornflour and mix well together. Divide the mixture into equal portions and shape each into a small patties. Heat sufficient Ricela rice bran oil in a pan, place the patties in it, few at a time, and shallow-fry, turning sides, till golden and crisp on both sides. Drain on an absorbent paper. Place them on a serving plate, garnish with spring onion juliennes and serve.