Those momos look ekdumai mitho, imported from Nepal ho? :-) Okay here is a short and easy recipe for momo achaar. 1) Heat one or two teaspoon of oil in a pan. 2) Add methi to it (if you like it's taste). 3) Add garlic cloves to it. 4) Add diced tomatoes and saute for a min or two. 5) Add salt and spices according to your taste. 6) Put it in the mixture and add green chillies, blend it and your achaar is ready to serve.