65438+February 14 answer: avocado
Analysis: Avocado is avocado, also known as avocado, camphor tree pear and avocado. Fruit is a kind of fruit with high nutritional value, rich in vitamins, fat and protein, and high in sodium, potassium, magnesium and calcium. Besides being eaten as raw fruit, it can also be eaten as dishes and canned food. Nuts contain fatty oil, which is non-drying oil, with mild aroma, specific gravity of 0.9 132, saponification value 192.6, iodine value of 94.4, unsaponifiable matter 1.6%, and are used in food and cosmetics industries.
How old is avocado?
Avocado, formerly known as avocado, originated in Central America. According to records, avocado may have a history of tens of thousands of years and was once on the verge of extinction.
Tropical shea butter trees can grow to 20 meters, but their flowers are very small, the diameter is less than 1 cm. It takes half a year to cultivate a fruit and needs a lot of nutrients, so the fruit setting rate of shea butter is very low.
Some biologists believe that the Pleistocene giant animals were the earliest diners and seed spreaders of avocados. More than a million years ago, the biodiversity of the American continent far exceeded people's imagination. This continent is full of Pleistocene herbivores, such as mammoths, mastodons, ground sloths and ivory elephants.
These behemoths devour avocados. The bitter elements contained in the seeds make avocados difficult to chew, while the thick pulp makes them stay in the digestive tract of the behemoth for a long time and finally be taken to a long place. In this way, avocados spread their seeds everywhere Its big seeds are rich in nutrition, which can help them take root and sprout in the new environment.
Unfortunately, it may be the change of climate or the arrival of human beings, which makes the behemoth gradually extinct. Avocado has lost its seed transmission channel and is also in danger of extinction. But these avocados, which once evolved with giants, still hang quietly on the branches, and the flesh is still thick. This time, it was not a behemoth that helped them continue their race, but Homo sapiens.
Some scholars believe that Homo sapiens gradually spread and took root in the American continent, and avocado was discovered and preserved by these prehistoric "farmers' uncles". They like the taste of this food and gradually learn what tools to eat and how to grow them.
During the Aztec period, people began to make guacamole, which added pepper, garlic, onion, coriander, lime juice or lemon juice.
/kloc-in the 0/5th century, Spanish navigators lamented in their diaries: "The flesh of avocados is as delicate as cream and tastes pleasant."
In the18th century, British naval cadets found that applying guacamole to the hard biscuits they ate on the voyage could soften them. Soon, avocado went to the world in the name of "naval butter".
19 1 1 year, CarlSchmidt, 2 1 year old, went to Mexico and brought back several top-class butter fruit trees, but only one fruit tree named "fuerte" survived the California cold wave in 19 13.
1926, RudolfHass, a California postman, discovered an avocado tree and named it "Hasstree" after himself, which later became an important avocado variety.
Since the 1990s, with the expansion of Spanish immigrants, avocados have gradually entered American kitchens, and even become a necessary food for watching the Super Bowl (the annual championship game of Major American Football League). His popularity latitude has also expanded from nutritional value to quality of life, and his high price has also made him labeled as "middle class" and become a symbol of pursuing healthy life and quality.