1. Cook the fettuccine according to the package instructions. Drain and set aside.
2. In a blender, combine the soaked cashews, vegetable broth, nutritional yeast, lemon juice, garlic, salt, and pepper. Blend until smooth.
3. In a saucepan, heat the olive oil over medium heat. Pour in the blended sauce and cook for 5-7 minutes, stirring frequently, until the sauce thickens.
4. Toss the cooked fettuccine with the sauce until well coated. Serve immediately.