Add mustard leaves, spinach leaves and radish to the pressure cooker along with ½ Cup water. Pressure cook for 1 whistle and remove from flame.
Heat oil in a kadai or saucepan. Add cumin seeds, hing, ginger, garlic, onions and green chilli paste. Stir fry for 2-3 minutes or until onions soften.
Add tomatoes, coriander powder, chilli powder and salt. Cook till tomatoes are soft, about 5-6 minutes.