Heat 1 teaspoon oil in a pan (cast iron is best) over medium heat. Add 100 g green finger chillies and 10 cloves garlic to the pan. Cook, stirring now and then, until blistered. Remove from the heat and place onto a plate.
Next, add ½ teaspoon cumin seeds to the pan. Roast, stirring occasionally, until fragrant and slightly browned. Remove from the heat and transfer to the same plate.
Transfer the roasted ingredients to a large mortar and pestle, along with salt to taste and fresh coriander. Use the pestle (club) to pound the mixture until it breaks down to a coarse paste. You may need to intermittently scrape down the sides.
Notes
* I like to use smoked salt for extra depth of flavour, but any coarse sea salt will do.