Boil salted water and cook macaroni until al dente, then drain while reserving some pasta water for later adjustments.
Soak cashews in hot water for 10 minutes to soften them for blending into a smooth sauce.
Blend cashews with plant-based milk, nutritional yeast, lemon juice, and spices until completely creamy and lump-free.
Heat the sauce in a saucepan over medium heat, stirring continuously until it thickens and becomes glossy.
Combine cooked pasta with the sauce, mixing thoroughly and adjusting consistency with reserved pasta water.
Add optional flavors or vegetables, adjust seasoning, and serve warm for the best texture and taste.