Wash and roughly scrub the arbi (I have kept a scrotch brite seperately in the house for scrubbing potatoes and arbi etc)
Steam for about 6-8 minutes till a tender. I have this microwave steamer at home which is so handy and convenient to steam stuff, its my all time favorite cookware. You can use any steaming method you like.
Let it cool and peel of the thick skin using a knife (Surprisingly, it does not itch so much after steaming)
Chop the bigger ones into 2 pieces and leave the smaller ones as it is.
Mix all the dry masalas,onions with arbi.
Grease a tray and put the masala arbi in it.
Grill at 200C for about 10 minutes or so, stirring once inbetween.
In a small pan, take 1 tsp of oil and add mustard seeds and fry till they start spluttering.
Pour over grilled arbi and mix well.
Garnish with chopped corainder leaves and serve with hot paranthas or phulkas.