Wash the shrimps. You don't have to peel and devein them.

Place the shrimps in a frying pan to simmer with a cup of water. Let them until the water is absorbed.

Then blend the lemon, oil, oregano and a little pepper if you like. Pour the dressing over the frying pan and place it over heat until it starts to boil.

Finally serve everything in a deep bowl or a pyrex dish.