Though there are more than 30 varieties of this herb, the most popular are curly-leaf parsley and the more strongly flavored Italian or flat-leaf parsley. Fresh curly leaf parsley is widely available year-round, while Italian parsley must sometimes be searched out in gourmet produce markets. Parsley is sold in bunches and should be chosen for its bright-green leaves that show no sign of wilting. Dried parsley is available in the spice section of most supermarkets but bears little resemblance to the flavor of fresh. Parsley is an excellent source of vitamins A and C, though these vitamins are often destroyed by different methods of cooking. Juice is a liquid naturally contained in fruit or vegetable tissue. Juice is prepared by mechanically squeezing or macerating fresh fruits or vegetables without the application of heat or solvents. For example, orange juice is the liquid extract of the fruit of the orange tree. Juice may be prepared in the home from fresh fruits and vegetables using variety of hand or electric juicers. Many commercial juices are filtered to remove fiber or pulp, but high pulp fresh orange juice is a popular beverage. Juice may be marketed in concentrate form, sometimes frozen, requiring the user to add water to reconstitute the liquid back to its "original state". However, concentrates generally have a noticeably different taste than their "fresh-squeezed" counterparts. Other juices are reconstituted before packaging for retail sale. Common methods for preservation and processing of fruit juices include canning, pasteurization, freezing, evaporation and spray drying.