This vegan potato gratin with cashew sauce comes completely without animal ingredients. To replace the cream sauce, we use pureed cashews, oat milk and additional yeast flakes for a cheesy, creamy taste. The recipe is quick to make and therefore ideal for after work or a relaxing weekend.
If you want additional flavours or like your gratin to be a little more firm to the bite, you can easily vary the basic recipe: The potato and onion slices can be covered with vegan minced meat or different vegetables such as courgettes or mushrooms. Of course, the vegetables should also be well baked so that the individual pieces can be easily pierced with a fork.
Boil the cashew nuts briefly in enough water and then leave them to soak in the simmering water for about 15 minutes. Drain the water and let the cashew nuts drip off.
At the same time, peel the potatoes and cut them into evenly thin slices. Ideally, all the potato slices should be about the same thickness so that the gratin bakes well and evenly.
Peel the onion and also cut into thin slices.
Preheat the oven to 200°C and prepare a large casserole dish.
For the cashew sauce, put the oat milk, vegetable stock, yeast flakes, garlic cloves and spices in a blender with the soaked cashews and puree for a few minutes. The sauce contains a lot of liquid and will therefore be very thin after pureeing, but will thicken when baked. In any case, the sauce should be completely lump-free after pureeing. Season the prepared sauce again and add more salt, pepper or additional spices (e.g. nutmeg) as required.
Layer the casserole in the baking dish:
Bake the casserole in the preheated oven for about 60 minutes. If the potato slices are very thick, leave the casserole in the oven longer; if the potato slices are very thin, remove the casserole a few minutes earlier. The potato slices should be easy to pierce with a fork, the slices or the sprinkled cheese should have turned golden brown.
Leave the oven-ready gratin to cool for 10-15 minutes before serving!
Need more yeast flakes? We also have 500g packs!