Clean, wash and finely chop the keerai.
Pressure cook the keerai, tomatoes, garlic and moong dal until 3 to 5 whistles, adding enough water.
When the pressure has reduced, open the lid.
Add salt as per taste and mash well.
Heat the oil in a frying pan.
Fry the red chillies and mustard seeds.
Pour this over the masiyal and stir once.
Serve with hot rice.