Wash the arbi and add them to pressure cooker along with water. Pressure cook them till you get 1 whistle. After that cook for 1 more minute on lowest heat setting.

When the steam from the pressure cooker is gone, remove the arbi from the cooker and let them cool down. Then remove the peel from the arbi and cut the arbi in midum size

Take a pan add oil heat add ajwain
then add chopped tomato,add turmeric powde, red chilli powder, coriander powder and salt to the pan and mix well

Then add cut arbi and mix well add one cup water and cook the arbi for 2-3 minutes on medium flame.
Serve it hot with roti