Cook the pasta according to the package.
Once the pasta is drained, rinse it in cold water until the pasta is no longer hot. You can soak it in ice water with ice cubes to quicken this step up.
Mix the paste with 1/4 cup of pesto.
Next, you'll add in the spinach. If you want to thaw spinach quickly place it in a bowl of cold water in the box, or use the defrost feature of your microwave to thaw it. Drain the spinach by squeezing out all the excess water.
Add the sun-dried tomatoes and pine nuts and stir in the remaining pesto.
Add salt and pepper to taste.
Serve immediately, or it can be covered and refrigerated until you're ready to eat.