Citrus includes oranges, limes, tangerines, lemons, etc. Varieties include oranges, tangerines, mandarins, limes and grapefruit. Squeezers are used for squeezing juice from citrus such as grapefruits, lemons, limes, and oranges. All fruits except berries, grapefruit, limes, and lemons must be avoided. This includes grapefruits, lemons, limes, oranges, and various other types and hybrids. Bartenders handling limes and other citrus fruits while preparing cocktails may develop phytophotodermatitis. It is served in bowls with minced onion, limes and tortillas. It is usually served with limes and cane or brown sugar. However, margaritas in Mexico are generally made with Mexican limes (Key limes). Switcha is a "lemonade" made with native limes. There are various approaches to the cultivation of Key limes. Persian limes appear to be more phototoxic than Key limes. On one short section of the Rhaetian Limes, a solid stone wall was erected. More such Gau forts have been detected north of the former Limes as well. They traveled across the Arabian Peninsula and eventually settled in the Roman "limes".