Store extra pesto in an airtight glass container for up to a week in the refrigerator. Use it throughout the week to top pasta, toasted garlic bread, or roasted veggies.
To make ahead of time: I recommend you keep the grape tomatoes whole and drizzle with the glaze just before serving.
Ready to use balsamic glaze can usually be found by the vinegars at the grocery store if you don't want to make your own. It's easy and economical, though!!