Arugula, also called roquette or rocket, has long, spear-shaped leaves that resemble dandelion greens. They have a spicy, peppery, mustardlike bitterness and aroma. Select dark green leaves 3 to 5 inches long; the more mature the green, the stronger the flavor. Wrap the roots in moist paper towels and place them in a plastic bag; store in the refrigerator for up to 2 days. Wash the sandy leaves thoroughly before using.

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