Preheat oven to 160°C
Start by evenly distribute the sliced red pepper and onion onto a foil lined baking tray. Add the garlic cloves into the tray without removing their skin, this will prevent the garlic from burning. Then drizzle the olive oil over the veg and season with salt and pepper. Toss to coat and pop in the oven for 25 minutes.
Meanwhile, pour water into the bowl of cashews and leave to soak (the water should be room temperature).
Once the veggies have been cooking for around 15 minutes, add the macaroni to salted boiling water, setting the timer to the packet instructions time, minus 2 minutes.
When the oven timer goes off, remove the tray from the oven and remove the garlic and their skins.
Using a blender, add the roasted red pepper and onion along with the soy milk, nutritional yeast, cashew nuts, lemon juice and dijon mustard.Blend for a couple of minutes until smooth and creamy. Just a warning – when cold it doesn’t taste like the final dish don’t worry!
Reserve a mug of pasta water before draining the pasta and adding to the pan. Now add together the drained pasta and the roasted pepper, cheesy sauce into the pan.
Heat on low until the pasta is al dente and the sauce is nicely incorporated. Add some salt is needed and serve with lots of black pepper.