I needn't have worried, it's really quick and simple, and with a few basic ingredients you can have a great tasting snack or meal.
The recipe I followed is here.
I decided to use red onions rather than regular white onions, because I prefer the flavour. I also used mature cheddar, but I think this recipe would be delicious with a mix of cheeses.
The smell was divine while they were cooking, and Flossie sat in front of the oven the whole time with her nose in the air!
I think these would be perfect for a picnic or in your work lunch box, they were very tasty and needless to say they didn't last long!