Soak matar for at least 6 - 8 hours, then wash them properly, put them in the pressure cooker along with oil, salt and turmeric, close the lid and cook on high for 1 whistle, then make the flame low and cook for 20 minutes further.
When the pressure cooker cools down completely then only open the lid. Add chopped ginger, green chillies and coriander.
Take out the cooked matar in a bowl. Then add potatoes, tomatoes, onion, green chillies, red chilli powder, jeera powder, chaat masala, black salt, amchur powder and lemon juice to the matar. Garnish with chopped ginger and coriander. Serve hot. A very healthy and tasty chaat.
