In a food processor with the S-shape blade, add the basil, pine nuts, and garlic. Pulse a few times to chop. Add the lemon juice, nutritional yeast, and salt, and pulse again to roughly combine. Turn the food processor to a low speed and drizzle in the olive oil. Continue blending until the mixture is combined, but there is still some texture. Set aside.

Boil a large pot of water and add the pasta and a generous pinch of salt. Cook until al dente, about 7 minutes. Strain and add the pasta back to the pot. Pour in the pesto and toss to combine. Transfer to bowls and serve.