Place the walnuts, garlic, Parmesan, sundried tomatoes, olive oil, red wine vinegar, and water in the bowl of the food processor (I used a mini one). Puree until as smooth as desired. Season with Kosher salt and freshly ground black pepper, to taste.
Notes
Pesto will keep in an airtight container in the fridge for up to 1 week. Drizzle with olive oil to keep from drying out.