Limes are a member of the citrus family. We are most accustomed to the Persian lime, which is shaped like a lemon (but generally smaller), with a thin green rind and pale, fragrant green pulp. Their high acid content and tartness make them a powerful cooking ingredient.
In Season: Persian limes (the most widely available limes in the United States) are available year-round.
What to Look For: Look for smooth skin with no brown spots; avoid dried-out limes. The fruit should be heavy for its size and give slightly when pressed.
How to Store: Fresh limes will last about 10 days in the refrigerator. Cut limes can also be refrigerated up to five days.