Garlic Scapes are the flowering stalks of hardneck garlic pants. They are commonly found in late spring to early summer. They have a mild garlic flavor and is a wonderful base for pesto. If you want to tone down the garlic flavor, feel free to toss in a few basil leaves to the mix. While I used walnuts, a variety a nuts would work well here. Substitute what you have readily available at home. This is also a double batch, it makes a lot. While it will keep for a while, feel free to half everything.