- Add oil to a heavy bottomed wide pan. When heated, add mustard seeds, cumin seeds when splutters, add fenugreek seeds and red chilies. 
- Now add the finely chopped onions and sauté a minute. 
- Add ginger garlic paste and green chilies and cook until the raw smell goes off. 
- Cook until onions are translucent. 
- Now add finely chopped tomatoes or puree. Here I am using finely chopped tomatoes. 
- Cover and took until the tomatoes are mushy. 
- Add turmeric, red chili powder, coriander powder, cumin powder and salt. 
- Mix well and cook for a minute or two. 
- Its the time to add our most important ingredient for pulusu is tamarind juice. Mix well. 
- Cover and cook on a medium low flame until the oil oozes out. 
- Add the fish pieces one by one and arrange them so that they are nicely dipped in the pulusu.  
- Carefully mix the pulusu and cook them for 3-4 mins. Do not over mix as the fish pieces will breakoff. 
- Sprinkle the chopped coriander leaves and switch off the flame. 
- Serve hot with white rice.