Heat a small skillet over low heat. Add the walnuts, and toast for 3 to 4 minutes. Remove from heat.
1 cup walnuts
Place the walnuts, garlic, and salt in a food processor. Pulse just until the walnuts are finely crushed (not a paste).
2 garlic cloves, pinch salt
Slowly drizzle in the olive oil while continuing to pulse.
¼ cup olive oil
Transfer to a bowl, and stir in the Parmesan cheese.
¼ cup parmesan cheese
Serve immediately with pasta, or refrigerate until ready to use.