cashew nut (castanha de caju) and then there is the pseudo-fruit, which is called "cashew apple" in English and simply caju in Portuguese.
While the cashew nut is widely known and enjoyed in many parts of the world, it is primarily in Brazil where the virtues of the cashew apple are appreciated. Even in other countries, such as Vietnam, India, Nigeria and Mozambique, where there is widespread cultivation of the cashew tree for production of cashew nuts, the cashew apple is not widely consumed and usually left to rot. A situation which, to most Brazilians, would be a crime, and which from a nutritional standpoint certainly is. Cashew juice contains 200-220 mg of Vitamin C per 100 ml, plus a variety of other valuable micro-nutrients.
tannins - the astringent plant polyphenols which are responsible for the "woody" or "puckery" feel of black teas, red wines, and many unripe fruits. For me the presence of tannins, especially in excess, makes it feel like a have a mouthful of wooden teeth. However any individual perceives the presence of tannins, that person is likely to be able to identify their presence easily. Some people are averse to any hint of tannin, and for those people cashew juice is not a recommended waker-upper in the morning. Those who enjoy it are likely to appreciate the juice. Other than its tannic qualities, cashew juice is moderately sweet, and the taste carries a faint hint of cashew nut flavor. The texture is like a non-juicy apple.
Because the skin of the cashew apple is very thin, the fruit is not suitable for ong-distance transportation to markets outside its cultivation area. Consequently, even in Brazil, it's only in those regions where the cashew is grown that one is likely to see fresh cashew apples for sale.
Cashew apples are used to make conserves, preserves and sweets as well as juice, and the juice can be fermented and then distilled to make spirits. The largest cachaça distiller in Ceará, Ypioca, makes a distilled cashew apple spirit called Acayú.
Because of the fragility of the fruit, if you are desirous to know what a fresh cashew apple tastes like, you will probably have to come to northeast Brazil to try it. You may or may not like it when first sampling it - cashew apples and cashew apple juice are often an acquired taste - but whether you do or not, you'll definitely love this part of Brazil, so the whole trip will not be for naught.