Fantastic Crispy Tempura Batter

"Whenever I have tempura at a restaurant it is always so light and crispy, the boxed store-bought stuff is okay providing you rush to the table within minutes to eat it or it gets soggy and soft, I have tryed many tempura recipes over my 35 years of cooking I have to say this one is the best, it produces a very light crispy coating that holds up well --- I have used this to make tempura veggies and froze them after deep-frying in this batter, and just reheated them in a small amount of oil, also with bite-size meaty pieces of fish and with about 15 large peeled shrimp cooked about 3 minutes --- remember the tempura must sit out at room temperature for 10 minutes before using, If you want to make a double recipe of tempura, then make two exact recipes using two separate bowls, do NOT double the recipe and make it all in one bowl it will not work --- use only rice flour for this anything else will not work the same and use only a light-coloured beer."