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"Make one with a topping and one without then place the one with topping on top of the other."
That's cheating!
"You could use a loaf tin, they're deep sided, it would be narrow but deep..."
True, but it's still not quite what I'm after. I suppose I could do several....
"My lasagnes are always delicious but very sloppy. If I made one that deep I'd be serving it with a ladle."
Can't be having that! I want a tower of lasagne standing proud.
Thanks for your contributions so far!