I saw this on Pinterest and thought it might be something nice to try. So, here is my version of events!
I didn't follow a recipe, I just took inspiration from the picture that I found.
First I sliced two colours of courgette thinly. I used my mandolin. I can only use this when hubby is not around. Earlier in the year I sliced the side of my thumb off using it, so it makes him a bit squeamish - sorry!!
Then some new potatoes.
I decided to place them into two cast iron gratin dishes that I had coated lightly with stir fry oil (olive oil flavoured with garlic and chilli).
I sort of layered the various veggies, but not in any strict sort of pattern. Then I added some sliced tomatoes.
And some thinly sliced onion. I wouldn't add whole slices of onion as I'm not sure they would cook at the same rate as the other veggies. You could cook off some onions first though and add them I guess.
Now, the picture I found seems to show the veggies topped with cheese. I didn't want to do this as it wouldn't go with the chicken that I planned to serve the veggies with. So, I mixed up a little vegetable stock with some dried herbs and salt and pepper. I poured a little of this into the base of each of the gratin dishes and topped with a little more seasoning.
Then I covered with foil, put in a couple of holes to vent any excess steam out and onto a baking tray to go in the oven.
Here they are all done and ready to eat. I cooked them at 200 degrees c for 30 minutes. I removed the foil for the last 15 minutes to allow them to brown on top. A few of the onions got a bit too caremelized for hubby, so you might do better to tuck them in more than I did.
They were very nice and made a good all in one accompaniment to our chicken for dinner. We are having the second one tomorrow with sausages - and I will add some cheese to the top of the veggies so they don't brown too much when I heat them in the oven!