Who said that magical fire can’t exist in real life?
All you have to do is:
1) Take a bit of boric acid.
2) Mix it with any kind of alcohol. (Vodka would be just fine)
3) And fire it. ( But be very careful!)
P.S. Don’t try to burn people you don’t really like. It didn’t seem to work for the guys in the Seven Kingdoms. You might get yourself in trouble.