For aloo matar, heat 1 tbsp oil in a pan and add heeng and jeera, let it splutter, then add ginger green chillies paste, saute for few seconds, then add red chilli, dhaniya and haldi powder, mix well, then add half of grated tomato, cook on low heat, until all the moisture evaporates and oil comes out, then add matar and potato, mix well and add water and salt, simmer for 5 - 7 minutes, sabji is ready.