I agree, it is almost certainly a misprint. The cost alone of deep frying in butter would be restrictive, couple that with the low flashpoint (around 170C) and you have a definite no go. Ghee or a ghee / oil mix would be possible but Im not sure the taste would be that nice. Veg ghee is possible though. I might give that a go one day. Also, I'll try the microwave trick, I bet that goes on a lot, especially with a soggy batter mix.