Makes 1 1/2 cups pesto. Garlic scapes are the soft, lime-green-colored stems and unopened flower buds of hard-neck garlic varieties. Scapes have a mild garlic flavor and a slight sweetness, which makes them a prized addition in the kitchen. You can find them in the early summer and midfall at farmers' markets. If you grow your own garlic (which is easy), trim the scapes off before their flowers open. This forces the plant to focus on bulb production and increases the size of the garlic cloves.