Homemade pesto is super easy to make and can add so much flavor to dishes you probably already make. Fresh store-bought pestos (like the kind you can usually find in the deli section) are fantastic too. Lately I have been getting a large bunch of basil in my CSA deliveries, and more often than not, I turn it into pesto. This is most easily done with a food processor, but a good blender will work too, or you can do it by hand with a mortar and pestle if you're cool like that.
2-3 ounces fresh basil leaves
1/4 cup grated Parmesan cheese
1/4 cup pine nuts
a generous 1/3 cup olive oil
1/4 teaspoon salt
juice from 1/2 a lime or lemon
1 clove of garlic (optional, I forgot to buy garlic this week so I left it out)
Puree in food processor. Store in an airtight container in the refrigerator for up to a week.