Salted Caramel Crumble Bar

I wish I could say this was our idea, but it is based on a recipe on an American baking blog that I loved the sound of. It was incredibly buttery even by our standards, so we set about making a version of our own that was closer to shortbread and filled with home-made caramel and flakes of sea salt. It’s been on our menu for years now and it continues to be a best seller. We make it using our home-made caramel but it’s equally lovely with a tin of shop-bou