Preheat your oven to 180°C/160C Fan (350°F). Next, boil the sliced potatoes until they're almost cooked but not too soft. Then, drain and let them cool.
While the potatoes are boiling, heat some oil in a pan and sauté the chopped onions, leeks and garlic until soft and fragrant. Add any other ingredients you want to add including the salt and pepper and cook for a few more minutes, allowing the flavours to meld.
Once the potatoes have cooled, layer half of them at the bottom of a greased ovenproof dish. Then, spread the onion, garlic, and leek mixture on top of the potatoes. Place slices of vegetarian cheese on top, covering the entire surface. Repeat with another layer.
Layer the rest of the sliced potatoes on top, pressing down slightly to ensure an even surface. Finally, pour the cream over the entire dish, making sure it seeps between the layers. Add more cream if you need to.
Place the dish in the preheated oven and cook for about 30-35 minutes, or until the cheese has melted and the potatoes are cooked through. The top should be golden and bubbling.
Once cooked, remove the vegetarian tartiflette from the oven and let it sit for a few minutes before serving.
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