Spanish limes have tough, green-brown skin that resembles leather. The golden inner pulp can taste sweet or sour, with flavors similar to limes and lychees. The fruit's juice can stain, so warn consumers. Spanish limes are most often eaten raw out of hand, or they can be blended into jams, desserts or tropical beverages. They are also called mamoncillo. The fruit is available year-round from subtropical markets.