Take a pan add oil & butter then add cumin seeds, then chopped garlic & when garlic becomes red then add onions & Then ginger & saute it till onions are translucent

Then add capsicum & saute it for 2 minutes & Then add tomatoes & saute it
Then add all spices to it & salt per taste

Now add grated potato & chopped coriander & mix it properly for 2 minutes
Then close the flame & remove this mixture in bowl & add 1/2 lemon juice

Now for making spicy butter tadka take 1/2 spoon kashmiri red Chilli powder & 1/2 spoon pav bhai masala & 4 spoon Amul butter & 1 spoon chopped coriander
Heat butter in tadka pan & close the flame & add all ingredients

Now cut pav into half from middle & put non-stick Tawa on gas
Now put one spoon prepared butter on Tawa & put pav on it & roast it from both sides & Then add veg mixture on it & apply butter on top & bottom

Now your butter masala pav is ready to serve