Rhobs el Arsa
The Rhobs al Arsa has long been viewed as a citron hybrid, though a different cultivars have been suggested for the parent, for example, Moroccan citron as a male parent and sour orange as the female parent, citron or lemon and a mandarin., or citron and the lime. Detailed genomic analysis has shown Rhobs al Arsa to be highly similar to several cultivars of "Citrus limetta", the limetta or Persian sweet lime, and likely shared a common origin with them, arising from a cross between citron ("Citrus medica") and sour orange ("Citrus" × "aurantium"). The common lemon arose from a distinct hybridization event involving the same two species.
Saint Clement's (cocktail)
The Saint Clement's is a non-alcoholic cocktail. Though the ingredients may vary, it consists of orange juice mixed with bitter lemon, usually in equal proportions; the name of the drink refers to the English nursery rhyme Oranges and Lemons. The drink is therefore named (indirectly) after either St Clement Eastcheap or St Clement Danes, both churches in London. The traditional recipe calls for equal parts orange juice and lemon juice served over ice in a highball glass. There are many variations, in which the lemon juice is replaced with a sweeter drink (like lemonade), or even a carbonated citrus-flavored soft drink (like Sprite, 7-Up, or Fanta Lemon).