I used beef dripping in place of the duck fat but wasn't really that keen - doesn't sound too healthy to me. Turned out fine and tasted OK though. I cooked them on the BBQ plate. Dividing them into 12 seemed to make them too small, so I ended dividing into 6 and making bigger ones. I made them for the Chorizo Quesadillas, and really they were a bit big (too filling - about dinner plate size). But if you were going to use them for sandwich wraps I think you would need to make them bigger. Would be interested to hear what others think about this, and whether they would be OK for sandwich wraps.