Wash and soak matra in three cups of water overnight. After soaking matra will be about 2 1/2 times the volume of the original.
Dry roast the cumin seeds and coriander seeds separately, until they are brown and you can smell their aroma. Let them cool and grind to powder consistency.
Put the matra in a pressure cooker with 2½ cups of water. Add the salt, ginger, and green chili. Cook on medium high heat.
When the pressure cooker starts to steam, turn the heat down to medium and cook eight to nine minutes more.
Turn off the heat and wait until steam has stopped before opening the pressure cooker. Matra should be soft and tender.
Add all the spices; this is the time to adjust the salt and pepper to your taste. Mix the spices well. Add a little water if they look too dry, the gravy should be thick.
Serve warm garnish with ginger and green chili and lemon.