Soak matar (yellow peas) overnight or for 6 hours. Then pressure-cook it with salt and half tsp turmeric powder with enough water that should rise atleast 1 inch above the matar. You have to give it 2 whistles and not more. The matar should hold shape and yet be cooked.
Cut potatoes into small cubes and fry them in a little bit of oil till they are completely cooked.
In a kadai, heat 2 tbsp mustard oil and temper with dried tej patta, dried red chillies, green cardamom, one inch cinnamon and cloves.
Then add onions finely chopped and stir-fry. After about 4 minutes, add garlic paste and ginger paste and fry with the onions on medium heat.
When the onions have cooked, throw in the tomato. Then add cumin powder, coriander powder, Kashmiri red chili powder and turmeric powder and salt to taste.
Take a little bit of the pea stock and add to this masala and cook the masalas till they start leaving oil from the sides.
Then add in mutton keema. Mix this well and fry for a few minutes. Add the entire pea stock into this and cover and cook the mutton keema. Takes about 10 minutes.
Add the boiled peas, fried potatoes, little bit of water and 1.5 tbsp ketchup or any momo red chili sauce for a greater spunk.
Cover and let this all cook for another 5- 6 minutes. Uncover and add ¼ tsp Bengali garam masala, split green chilies and turn off the heat
Serve with chopped onion, green chillies chopped and chopped coriander leaves and squeeze lemon on top