"- Basil Pesto can be made up to three days in advance. Refrigerate it in a sealed container. - If you cannot find pine nuts, you can substitute them with a variety of other items such as walnuts, almonds, sunflower seeds, or pistachios. - If you prefer your basil pesto to be a little thinner, simple drizzle in more olive oil until you reach the desired consistency. - If you are unsure how to toast the pine nuts, check out this guide on How to Toast Nuts...."