PlumsThe trees that bear this delicious fruit first appeared in California in the late 1800s, transplants from Asia. Plums are believed to be one of the first foods cultivated, though the tree's origin remains a mystery.How to ripenThis tree fruit is an ideal candidate for spending some time in a sealed brown paper bag, where it will sweeten and soften in a day or two.How to storePlace ripe fruit in a plastic bag in the refrigerator.How to prepMost often eaten in a series of dripping-down-your-chin...