Cereal Prawns

There was a packet of freshwater prawns sitting in the fridge for over a month now. We caught them during one of our prawning sessions at Bishan. Decided to finally cook them since I found a packet of Cereal Prawn mix... Tasty but a little more on the salty side... This is actually quite unhealthy. The recipe required quite a bit of butter and 5 egg yolks but I decided to use 4. What difference does 1 make?  Anyway, now I have 4 egg whites sitting in the fridge... Still haven't decided what I'm going to do with them...