When you are ready to cook, place the raw peanuts (with skin or skinless) in the inner pot. Further add in 1.5 cups water to the inner pot.
Close the lid on the instant pot and select manual/high pressure. Pressure cook the peanuts for 15 minutes. Let the pressure release naturally for 10 minutes and then quick release the pressure. While the pressure is releasing in the instant pot chop onions, serrano peppers and cilantro leaves finely. Additionally, core and dice the tomatoes into 1/4-inch dice, and also cucumber to 1/4-inch dice.
When the 10 minutes are up release the pressure, discard the water and keep the peanuts aside.
In a bowl that will hold the salad, place the boiled peanuts. Further add in chopped tomatoes, cucumber, serrano peppers, and onion. Furthermore, add in chaat masala, black salt, ground black pepper, ground cumin, salt, cilantro and lemon juice. Mix well and serve fresh.