Wash the matta rice several times till the rice looks cleaned and doesn't leak too much brown liquid.
Transfer into a large pressure cooker - I use a 7 ltr one. Fill water to almost 80% of the cooker.
Add salt if using and close.
Keep on low flame till the "shh" sound comes. As the sound starts and progresses towards a full whistle, switch off - NO NEED TO WHISTLE. (refer notes)
Leave the cooker undisturbed for half an hour. Check if pressure is gone.
Open the lid and drain into a colander. Wash in cold water a couple of times, running through all the grains and making sure not to break.
Drain well. Fluff before serving.