
With a propane burner. Engineers, should NOT be allowed in the kitchen. Though bless Nath, I wasn't going to attempt this! For the record, this didnt work so well, as the flame was too large and slightly cooked the custard, and as propane is a liquid, when the torch was flipped upside down, the liquid ran to the top of the torch blocking out the gas and hence the flame would go out.
I am still after a good creme catalana recipe as the one I have tried did not result in a thick enough custard for my liking. Any ideas? Apart from using more thickener...
I have since purchase a butane burner so look forward to a more successful attempt to burn the top!