In a medium pot set over a medium heat, warm the soy milk, water and vegan butter/shortening/refined coconut oil/olive oil until the fat has melted.
500 ml unsweetened soy milk, 100 ml water, 100 g vegan butter, vegetable shortening (e.g. TREX), refined coconut oil or olive oil
Add the grated potatoes, nutritional yeast, garlic granules, smoked paprika and mustard to the pot and stir. Bring up to a boil then turn down the heat to let it simmer for 10-15 minutes until the potato is completely soft.
300 g (2 medium) potatoes, 3 tbsp nutritional yeast, 1 tsp garlic granules, 1/2 tsp smoked paprika, 2 tsp American mustard
Meanwhile bring a large pot of salted water to the boil. Once boiling, pour in your dry pasta and cook according to the timings on the packet. Drain the pasta and pour into a large baking dish.
350 g dry pasta
Preheat the oven to 240°C (465°F) fan.
Remove the potato mixture from the heat and add the vinegar and marmite/soy sauce/miso paste. Blend until smooth using a stick/immersion blender (or a jug blender) then taste and season with salt and black pepper. We suggest being quite generous with the salt here, start with 1/4 to 1/2 tsp and go from there.
4 tsp malt vinegar, 1 tbsp marmite or dark soy sauce or miso paste, salt and black pepper
Pour the warm sauce over the drained pasta in the baking dish and stir to combine. Sprinkle with the breadcrumbs - I like to add some a drizzle of oil on top too but this is optional.
3 tbsp dry breadcrumbs
Bake for 10-15 minutes until the topping is golden and the sauce is bubbling. Remove from the oven, allow to cool for 5 minutes, then serve.