In a pan add oil and heat it.then add cumin seeds and nigella seeds and hung.roast on medium flame for few seconds then add green chillies saute them and add salt, turmeric and red chilli powder.(red chilli is optional if you don't want to more spicy you can skip it.) Saute and cooked on low flame for two minutes.then add coriander powder,fennel powder and amchur.mix well and add 1/2 cup water.cover and cooked for two minutes.