Take 750 grams of boneless mutton and cut them into thin, long slices. Marinate it with 2 tsp of lemon juice and 1 tsp of salt.
Dry roast 2 tsp of coriander seeds (dhania), 2 tsp of cumin seeds (jeera), 1 piece of nutmeg (jaiphal, small size), 1 tsp of black peppercorns, 1 tsp of poppy seeds for 2 minutes in a frying pan over a medium flame and grind them to a fine powder when cool.
Make a smooth paste of 100 grams of raw papaya with skin and 6 pieces of whole green chilies in a mixie jar.
Add it to the mutton along with crushed fried slices of one large onion. Follow it with the ground masala powder, 1 tsp of garam masala powder, 1 tsp of Kashmiri red chili powder, 2 tsp of ginger garlic paste and mix nicely.
Put in 2 tbsp of cooking oil and mix nicely again. Cover and keep it in the fridge for about 20 minutes.
Insert the marinated mutton pieces in the bamboo skewers and keep them on a plate.
Grease 1 tbsp of cooking oil on the surface of a tawa and place the skewers one by one. Flip for a couple of times over a medium flame. After about 20 minutes of frying, turn the flame to high and remove the kababs when you see brown spots on them.
Your tasty and spicy mutton boti kabab is ready to serve and enjoy.