The correct temperature for deep-frying is 190 degrees C, which is moderately hot. If your fryer does not have a thermostat, you can test the oil by dropping in a cube of bread. It should take only about 40 seconds for the bread to brown. If it browns in 10 seconds, the oil is too hot and should be cooled. If it takes a minute, the oil is too cool and the batter will not crisp immediately. This causes the food inside to become soggy.
** Asian Recipes