I'm contributing to a charity afternoon tea in a couple of months and am thinking about using disposable foil baking trays (like the ones they have in Wilkos) so for easier transit and because I'll be doing traybakes. Does anybody know if I'll need to grease and/or line them first? Will be doing a chocolate tiffin and something sponge-based.
Just remember that pastry is self-greasing and cake is not. I have not used them but I would definitely line the bottom whatever I was cooking, and line the sides if baking a cake. You can always slide a knife down the sides, but you can't get one round the corner to release the bottom if it does stick.