Add 1,200 g or 42.3 oz water to mixer bowl and cook 10 min/steaming temp/speed 1/MC on.
While water is heating, prepare vegetables and arrange on bottom steamer tray.
When timer is up, add pasta straight to the mixer bowl and put steamer tray in place.
Cook 10 min/steaming temp/speed 1/reverse stirring veggies up half way through.
Pasta should be al dente, drain water from pasta and reserve pasta to an insulated server pot.
Put vegetables into mixer bowl and purée on 10 sec/speed 7/MC on (it does not matter if vegetables are not fully cooked).
Add cashews, water, stock, salt, paprika, mustard and nutritional yeast flakes if using.
Cook 15 min/100°C or 212°F/speed 2/MC on.
Purée for 90 sec/speed 9/MC on.
Stir desired amount of sauce through pasta and serve.