Marinate 500 gm beef with fine mixture of 1tbsp chilly powder, 1 tbsp pepper powder, 1 tbsp coriander, 1 tbsp garam masala, 1 tbsp vinegar, 1 tbsp ginger garlic paste for 30 mins.
Cook the beef in a pressure cooker for 20 min.
Cut raw banana & boil with salt and water . Keep it aside.
Take a pan and heat 2-3 tbsp of oil. Splutter Mustard and add chopped onion, ginger garlic paste and saute well.
Add curry leaves, 1tbsp chilly powder, 1tbsp turmeric powder, 1 tbsp meat masala, 1 tbsp coriander powder and keep sauteeing..
When the onions become transluscent add the cooked beef and mix well.
Add cooked banana and again mix well. Add some salt if needed.
Finally season with coriander leaves. Serve hot.