1. In a pan heat oil.Add mustard seeds,methi & cumin seeds & mix them. 2. Add chana dal,peppercorns,tamarind & cook all of them on low heat. 3. As chana dal gets the color, add green chillies & garlic.Cook till chillies become dry. 4.Once green chillies starts drying, add curry leaves & hing powder.Cook on a low heat till curry leaves dry out. 5.Add a pinch of salt & allow the mixture to cool down. 6. Blend the mixture & add salt to the powder if required.
Cook all the indgrediants on a low flame.
The shelf life for the gunpowder mixture is 2-3 weeks.