To make the pesto: Place all ingredients in the food processor and blend until smooth. Taste and adjust seasoning as you see fit.
To make the “pasta”: Slice the squash into very thin strips using a mandolin, julienne slicer, or spiralizer (see note below). If you’d prefer, use a vegetable peeler for wider, thin strips. Place squash in a medium bowl and toss with salt. Place squash in a colander and let sit for 25 minutes, allowing the excess water to start to drain away. Using a clean kitchen towel or your hands, work in batches to squeeze the moisture away from the squash. Place in a medium serving bowl.
Toss zucchini noodles with 1/2 cup ricotta pesto. Fold in tomatoes and parsley. Taste and season with additional salt and pepper if you’d like. This salad is best served the day that it’s made; I like to serve it immediately with crusty bread and cold wine, preferably outdoors.
Note: I broke down and bought a spiralizer last month to help make little veggie noodles. I was hesitant at first because we really don’t need any new kitchen appliances or tools, but it’s relatively inexpensive and we’ve been loving it. Alternatively, you can certainly use a mandolin or julienne slicer.