Take 6 pieces of green chilies (broken into half), 8 garlic cloves (peeled, whole), 1 piece of ginger (1.5 inches in size, sliced roughly), 1 slice of raw papaya with skin of 2 inches in size (cut into small pieces) in a chopper and chop them finely.
Add 750 grams of minced mutton to it. Blend it nicely and remove it in a bowl and keep aside.
Now, heat a frying pan over a medium flame and dry roast 1 tsp of black pepper corns, 6 pieces of cloves, 1 piece of mace (half a flower), 2 pieces of black cardamom (split), ¼ piece of nutmeg, 1 tbsp of coriander seeds and 1 tbsp of cumin seeds for about a minute or so until you smell the nice aroma. Switch off the flame and let the spices cool down a bit.
When the spices cool down, transfer them into a mixie jar and grind them into a fine powder.
Now, finely chop 2 pieces of medium-sized onions in the chopper, keep them in a bowl, and squeeze out the juice from them.
Add the onions to the mutton mixture along with the ground masala, ¼ cup of gram flour (roasted), 1 tbsp of chili flakes, ¼ tsp of turmeric powder, 2 tsp of lemon juice, 1 tsp of salt, a few finely chopped coriander leaves and mint leaves. Mix everything very nicely with your hand. Make a small hole in the middle of the mixture.
Place a small container in it with a piece of burning charcoal. Put some oil or ghee on the charcoal piece. Cover the bowl and let it smoke for about 15 minutes.
After 15 minutes, heat some cooking oil in a pan. While the oil heats up, take some skewers or pencils and stick a bit of the kebab mixture carefully on it. Shape it like a seekh and remove the pencil or skewer finally.
Repeat the process to make all the seekh kebabs and release them in hot oil one by one very carefully. Let it cook for a minute or so on one side. Flip them one by one gently. Remove then on a plate when they are cooked nicely on all sides and turn slightly golden-brown in color.
Your tasty and spicy homemade mutton seekh kebabs are ready to enjoy. Serve them hot along with onion rings, lemon wedges, and green chutney.