Leftovers Gratin

This is, in my opinion (and I’m sure that Megan will agree), one of the best throw together meals that we have done. It was conjured up after I remembered a conversation I had with a colleague about Mary Berry’s version of the classic fish pie whilst staring blankly at some leftover roast potatoes and cauliflower cheese (link to our previous roast dinner blog) and wondering what meal we could throw together. We took Mary Berry’s adaptation and adapted it further to create this wonderful throw together.

Ingredients that we used:

  • Leftover roast potatoes
  • Leftover cauliflower cheese
  • One fillet of fish
  • Breadcrumbs (we grated bread to make these)
  • Philadelphia


  1. Layer the potatoes on the bottom of a baking tray or pyrex dish and mash slightly so all potatoes are roughly the same height.
  2. Layer the cauliflower cheese on top of the potatoes.
  3. Place the fish on top of the cauliflower cheese.
  4. Place breadcrumbs over the top.
  5. Add dollops of Philadelphia over the top of the breadcrumbs.
  6. We then cooked for 30 minutes according to the cooking instructions on the fish


The brilliant thing about this recipe is that it is so versatile. If you have any leftover vegetables then they can be thrown in as well. This can also be done from scratch by parboiling and layering potatoes on the bottom, making a cauliflower cheese to layer on that (link here)  and then add the fish and breadcrumbs. The Philadelphia was used for simplicity but if you are making cauliflower cheese from scratch you could put some of the sauce aside to put over the top of the fish before adding the breadcrumbs. We were both shocked how well this turned out and we didn’t think we could turn a few leftover roast potatoes and some cauliflower cheese into something so delicious but it can be done!!


2 thoughts on “Leftovers Gratin

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