To make your pistachio pesto, add your fresh basil, toasted pistachio pieces, fresh lemon juice, garlic, nutritional yeast, salt, pepper, and red pepper flakes (optional). Pulse until combined but not completely smooth, scraping down a few times in between.
1 heaping cup fresh basil leaves, 2 tbsp toasted shelled pistachios*, 1 tbsp fresh lemon juice, 1 clove garlic, 1/2 tbsp nutritional yeast, 1/4 teaspoon red pepper flakes, 1/4 tsp salt, pinch pepper