Cook orzo according to directions on the package. Drain, rinse with cold water, and drain again.
In bowl, combine orzo, tomatoes and toasted pine nuts.
To prepare pesto sauce, combine remaining ingredients in a food processor or blender and process until well blended and smooth. Add to pasta and toss until well coated.
Chill until ready to serve. Garnish with basil sprigs if desired. Makes 4 side dish servings.