Preheat oven to 400 Fahrenheit. Place squash cut side down on a baking sheet and cook 40 minutes, or until tender when pierced with a fork. When squash is done, use a fork to scrape the spaghetti like flesh into a large serving bowl.

While the squash is cooking, combine the basil, spinach, garlic, walnuts, tofu, salt, and pepper in the work bowl of a food processor. Process into a thick paste, scraping down sides of bowl as necessary. Add the cheese and turn on the machine. Slowly drizzle in the oil with the machine running.

Bring one cup of water to a boil and add chopped sun dried tomatoes to the water. Cook for three minutes and remove tomatoes with a slotted spoon, reserving the cooking water. Use the leftover water to thin out the sauce by processing it in one tablespoon at a time until sauce is just thin enough to toss with the squash about five or six tablespoons. Transfer pesto to a bowl and stir in the tomatoes.

Toss one cup of pesto with spaghetti squash. Freeze the remaining two cups of pesto for future use.