No, this is not a typo, Bearss lemons do have two "s's" in the name and are a real thing. They first originated in Italy but now grow across Europe, and they are slightly larger than a Lisbon lemon so it has more juice and skin to zest (saying "skin" just sounds wrong here, right?). If a Meyer lemon is too sweet for you, then a Bearss lemon might be a perfect choice. It's tart, and, according to Citrus.com, has more juice than other lemons its size.