Tongren sweet potato fans are famous traditional foods in the northeastern part of Guizhou Province. The products are made up of rich sweet potato resources and traditional processing methods in the city. The reputation of the products covers several provinces such as southern Sichuan, western Hunan and eastern Fujian.

Tongren sweet potato fans have special geographical environment factors and human environment factors. In terms of geographical environment factors, Tongren City is located in the hinterland of Wuling Mountain, with superior ecological environment, good forest vegetation, no pollution source, excellent water quality, mild climate, no cold in winter, no summer. The heat is a subtropical monsoon humid climate with a seasonal climate. The annual rainfall is 1250-1400 mm, and the annual sunshine is 1171 hours. The rain and heat are in the same season, which is conducive to the growth of crops. The soil in the city is mainly neutral and slightly acidic, and the PH value is between 5-7, which is the ideal cultivation environment for sweet potato. In terms of human factors, Tongren Sweet Potato has a history of more than 300 years. “Sweet Potatoes” has a long history in Tongren City. According to Guangxu’s “Tongren Fuzhi”, Tongren is rich in sweet potatoes, and the people use sweet potatoes as food or sweet potato fans. Trading in the market, in the small-scale economic and social period, the Tongren sweet potato fans have become one of the sources of income for the local people. Tongren sweet potato has a long history of production and processing, and its brand awareness is relatively high. The products are made of high-quality sweet potato produced in 17 towns and towns in Tongren City, Wanshan District, and high-quality spring water below 100 meters in underground. The traditional technology and modern technology are combined and processed. Made. It has long-lasting rotten, delicious and delicious, diverse food methods, uniform thickness, semi-transparent state, no strips, soft handfeel, good elasticity, moisture ≤15%, starch ≥75%, ash ≤0.5%, The cooked broken strip rate is ≤10%, and the boiling time is ≥15 minutes. Production process First, the traditional process: potato selection → cleaning → crushing → filtration → sedimentation → smashing and slurrying → leakage powder and ripening → glutinous powder → drying silk. Second, modern technology modern sweet potato fan processing technology can be suitable for small and medium-scale processing, can also be used for large-scale processing, the production process is as follows (with starch as a direct raw material), raw materials for sweet potato fan processing: sweet potato starch for fan processing should be It is fresh and white in color, free from sediment, fine residue and other impurities, and has no mildew and no odor. 1, ingredients and snoring sweet potato fan processing can be snoring can also be directly seasoning processing, direct seasoning processing according to the ratio of dry starch and water is 5:4 modulation, adding additives can be. 2, dough and sweet potato fan processing and surface process is actually the process of bonding the starch together with the prepared enamel. The method is divided into manual and surface and mechanical and surface. 3. Extrusion molding First fill the water tank with water, ignite the coal fire and heat until the water boils; use a small amount of cooking oil to wipe the screw shaft of the fan machine and install the sieve plate. Then start the fan machine, pour from the hopper and a good starch milk mass, close the powder valve for about 1 minute, let the powder group fully mature, then open the valve, let the cooked powder group squeeze from the fan sieve plate under the thrust of the screw shaft Forming. 4, heat dissipation and cutting After the fan is extruded from the sieve plate, the small blower or fan should be opened, and the air outlet is facing the sieve plate to make the fans cool down. As the length of the fan continues to lengthen, when it reaches a certain length, it should be quickly cut and placed on the wire board with scissors. 5. Cooling There are natural cooling and cold storage cooling. 6, 搓 powder strips Soaked fans into the water soak for 10-20 minutes, the powder will be opened. Or use a frozen loose powder machine to powder. 7. Drying There are two kinds of natural drying and drying and drying. Initially put on the shelf to control water, do not easily move, avoid excessive scraps. After 20 minutes, gently spread the fans and fill the empty space. When drying to 40% to 50%, the knots and the fans below will be loosely loosened to separate them. When drying to 70% or 80%, remove the whitefly and change direction until the fan contains 14% water. 8. Packaging After drying, the fans can carry out cutting and packaging, and the finished products are sold. Selection of recipes 1. Ants on the tree Ingredients: one or two meat foam, 180 grams of sweet potato vermicelli, onions, ginger, dried chili peppers cut to the right amount. Practice: Soak the fans with warm water for three minutes (do not soak in boiling water). Pour a small amount of oil into the pot, stir fry the meat repeatedly, remove the water, stir fry the aroma, add the onion, ginger, dried chili, stir fry a few times, add the appropriate amount of soy sauce, water, sugar, salt, soaked Fans put in, repeatedly fry, ready to serve. Ants on the tree 2, chicken pure fans According to the conventional method of roasting chicken, when the chicken is cooked, when there is more soup in the shabu-shabu, put the soaked fans into the dish and stir-fry. (Similar to beef stew fans, etc.) Chicken stew fans Nutritional value Sweet potato in sweet potato fans contains a variety of nutrients needed by the human body. Each 500 grams of sweet potato can produce about 635 kcal of heat, containing protein (protein food) 11.5 grams, sugar 14.5 grams, fat 1 gram, phosphorus 100 mg, calcium 90 mg, iron (iron food) 2 grams, carotene 0.5 mg, It also contains vitamins B1, B2, C and niacin, linoleic (oily food) acid and the like. The content of vitamins B1 and B2 is 6 times and 3 times higher than that of rice, respectively. In particular, sweet potatoes are rich in lysine, while rice and flour lack lysine. In addition, sweet potato contains very low calorie, and also contains a substance similar to estrogen, which has a certain effect on protecting human skin and delaying aging.

Tongren sweet potato fan quality technical requirements First, the original accessories requirements 1. Brewing water: Groundwater in the area of ​​production, the water quality complies with drinking water regulations. 2. Second, the production process flow 1. Traditional process: pulverization → filtration → sedimentation → smashing and pulverizing → leakage and aging → 搓 powder → drying silk. 2. 10, water temperature 95 ° C to 100 ° C; (5) leakage powder and ripening: leakage powder temperature 30 ° C to 40 ° C, water temperature ≥ 95 ° C; (6) 搓 powder: into the natural water after cooling, use bamboo rafts to form a bundle. (7) Tanning: The leeward is naturally dry and the moisture content is ≤15%. Third, the quality characteristics 1. Sensory features: fine, pure and bright, neat and flexible, transparent; long cooking, good toughness, smooth and chewy. 2. 3. Safety and other quality technical requirements: Product safety and other quality technical requirements must comply with relevant national regulations.

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Producers within the scope of the production of Tongren sweet potato fans may submit an application to the Quality and Technical Supervision Bureau of Tongren City, Guizhou Province for the use of “Special Marks for Geographical Indication Products”, which shall be reviewed by the Guizhou Provincial Bureau of Quality and Technical Supervision and reported to the AQSIQ for approval. . The statutory testing agency for Tongren sweet potato fans is designated by the Guizhou Provincial Bureau of Quality and Technical Supervision.