When it comes to baking pans, there is a definite difference between a jelly roll pan and a cookie sheet (just like there's a difference between sheet pans and baking sheets). It all comes down to ...

For this recipe ... the pan until dissolved then leave to cool. Squeeze the lemons and oranges, so you have 150ml/5fl oz of both lemon and orange juice. Stir into the pan then strain the jelly ...