Season: Eureka and Lisbon lemons are available year-round in supermarkets. Meyer lemons peak in winter and spring.
Varieties: The two most common lemon varieties are the Lisbon and Eureka. Both are almost identical in size and shape, being oblong, having vivid yellow skin and acidic, juicy flesh. Meyer lemons are more sweet, with a thin, yellow-orange skin, have fabulously full flavor, and yield a high amount of juice.
Purchase: Choose lemons with firm, glossy yellow, unblemished skin and feel heavy for their size. The skin should be taut and thin and should give slightly when pressed.