Wash and slice your potatoes, eggplant, zucchini & tomatoes so that they are all roughly the same thickness and size (about 1cm thick). Cut the larger slices in halves or quarters. I don’t peel anything (yummier and so much more nutritious!) but feel free to do as you please.
Grease an oven-proof dish with a bit of olive oil. I like to use my cast iron pot but any baking dish will do. Place both potatoes in first, season with a little salt and drizzle with a bit of olive oil. Sprinkle some oregano leaves. Toss lightly to coat.
Repeat with the eggplant, then zucchini, onions & garlic, tomatoes & finally the green beans. Once you have got all of your veggies in the dish, pour over the tomato puree and kinda shake the dish a bit and poke around with a spoon (or use your fingers like I do) to get it all in there. Place a bunch of cherry tomatoes on the vine on top if you like for decoration.
Finally, drizzle with a little more olive oil and a bit of salt and bake for 45-60min, or until the veggies are soft and tender and browned and are caramelized at the edges. You may crumble some feta cheese on top to serve for extra deliciousness.