A limequat is a cross between a lime and a kumquat, rich in vitamin C. This produces a shiny, greenish yellow fruit. As with kumquats, the skin can be eaten and is the sweetest part of the fruit. The seeds are also edible. They ripen in autumn (US: fall) and winter. The fruit is eaten out of hand or made into marmalade or otherwise used as you might used limes of lemons. The fruit originated in China but is now found in California and Florida, Israel, Japan, Spain and South East Asia.