Well 15 is a tricky number, so I can't swear, but FWIW I used:
1 tbsp vegetable oil
Half 1/8 tsp methi powder
1 lvl tsp Kashmiri chilli powder
Half lvl tsp ground chillies
0.75 lvl tsp salt
1 lvl tsp cumin powder
0.5 lvl tsp black onion seed nigella
1 lvl tsp black mustard seed
1 tbsp white vinegar
It would've been 3 cloves garlic in addition, but I omitted on advice from LC.