This potato tart with onion and sweet potato is one of the easiest recipes there is. I love it because it serves as a side dish, and it is also perfect for lunch if you serve it with a good salad.
Slice the potato, onion, and sweet potato. Use a mandolin, a food processor, or a knife. Try to achieve even thickness on all three vegetables.Season them with oilive oil and a good pinch of salt
To assemble the tart, put a teaspoon of olive oil in the bottom of a cast-iron pan or baking dish. Then a layer of sliced potatoes, sprinkle some salt, rosemary, and half a teaspoon of olive oil.
Do the same with the onion layer and the sweet potatoes layer until you are done. Finish with a potato layer.
Cover and bake until you stick a fork to the potatoes and offer no resistance; this means they are perfectly cooked.Uncover and bake until the top layer is golden and delicious.