I need a good pesto recipe. Can I freeze some??

This girl at work made a foccacia pizza with pistachio pesto, goat cheese, and sundried tomatoes... it was amazing. If i remember correctly: In a food processor blend fresh spinach leaves, 2-3 cloves garlic, about 1 c. pistachios, and salt. Drizzle in olive oil until its reached desired consistency. like i said, it was delicious.