Joining everyone else in the craze we cooked this in the air fryer. It’s quick, no-hassle, and ensured the cheese was melted evenly throughout.
However, it is just melting cheese on toast, you can pop it under the grill.
Play around with the seasonings. You don’t have to use harissa. Go classic with some Chili or how about some chipotle? Honey and spice is really really nice!!