Author Notes This pesto is so creamy and flavorful, you'd never guess that it's dairy-free. The secret ingredient is nutritional yeast, which adds a Parmesan-like cheesiness. Toss this with hot pasta, spread it on sandwiches, or dollop it on grilled vegetables or thickly sliced summer tomatoes. —Gena Hamshaw Test Kitchen Notes One of the main ingredients in a classic pesto alla genovese is grated