In a small saucepan, combine stock and garlic cloves. Simmer for about 5 minutes, or until garlic is soft. Alternatively, microwave on High for 5 minutes in a microwave safe bowl.
Add basil to the bowl of a food processor; chop fine. Blend in stock mixture. Add Parmesan cheese and pine nuts; chop fine. Pesto can be refrigerated in an airtight container for up to 24 hours.
Cook pasta in a large pot of boiling, salted water until al dente. Drain well, and return to pot. Stir in pesto to coat pasta. Toss with tomatoes.
