For preparing royalla pachadi, fry prawns in oil till they turn brown in colour and keep it aside.
Heat oil in a pan. Cook fried prawns, red chilly powder, ginger-garlic paste, turmeric powder, poppy seeds, cloves, cinnamon, cardamom and salt for 15 min. Remove it from the flame.
Add tamarind paste, garam masala and mustard powder. Mix well.