Battering, also known in English as coating, consists in making a coat to cover food so that when we fry it, does not lose its juices. To make the cover flour is used, and after frying the food, it creates a crunchy coat. It can be done it in different ways: using only flour, with a mixture of flour and egg, or with flour and beer (orly pasta).
If only flour was used, food should be covered with it, shaken to remove the excess of flour, and fried.
When using the mixture, food can be firstly covered with the flour and then bathed it the beaten eggs. Beaten eggs can also be mixed with the flour and bathe the food in the mixture.
To make orly batter, flour must be put in a bowl, adding beer slowly to allow its blending, stir the mix to leave it smoothand without lumps, and put it in the fridge for an hour (covered with transparent plastic wrap). Then, food must be covered thoroughly using the batter and fried with a very hot oil to get a crunchy coat.
Orly batter was used in the 80s/90s to cook a very famous French recipe, Gabardine crevettes (Gabardine prawns or prawns in a raincoat) (for more information go to further references).
Another famous battering technique is the Japanese tempura, which even though seen as exotic, was indeed introduced by Iberian missionaries.
The battering made with flour and egg is a technique widely used to fry fish.