I know, I know ... there are 98 recipes for "beer batter" on this site, I checked! This one is slightly different. It's the variation I came up with after much experimenting. I can vouch for its lightness, as we dislike thick batter. If your oil is hot enough, and you follow the instructions, you should have light-as-a-feather fish fillets. It's hard to give a cooking time, as I do one fillet at a time because I use a wok, so I give an approx. time for frying 1 medium fillet.