Heat a pan. Mix together sweet corn, corn flour, salt, white pepper powder and add to the pan. Cook on high heat for five minutes or till the mixture thickens.
Add spring onion greens and mix well. Remove from heat.
Grease a plate or a barfi tray with oil and sprinkle with some corn flour, spread the sweet corn mixture on it, smoothing the surface. Set aside to cool.
Cut out square or diamond shaped pieces and dust with some cornflour. Deep-fry the pieces till golden.