Two, slicing. In order to make the slicing speed, good quality, there must be a special tool. Can not use a knife to slice directly. Slicing of special tools for the wire frame. Specific construction is: with a wooden board to make a bottomless four boxes, frame height 70 cm, length 150 cm, width 100 cm. In the hollow side with fine steel wire, every interval of 8 mm, fixed one, forming a wire frame. Operation, put the tofu right, the steel wire frame on the steel wire aligned with the tofu, the hand can be pressed to cut the tofu into slices. Each piece of specifications for: 10 cm long, 6 cm wide, 0.8 mm thick.
Three, drying dehydration. Drying dehydration can be used to dry and drying two methods. Drying radiators can be used as a heat source, around the house full of radiators, indoors like silkworms on the net shelf, put on the tofu sheet. Sun should choose a good light, away from the toilet and livestock pens in the place. Drying good dried tofu is soy sauce color, the surface of the pan oil, broken stubble is soy sauce color, no entrapment of white core for the top grade.
Four, warm oil puffing. Large pot placed in peanut oil (other oil frying does not produce a golden color), it is recommended that the pot of 10 kg of oil, each time the pot of 1 kg of dried tofu, the easiest to operate.
Burn the oil to 140 ~ 160 ° C, into the dried tofu, with a hand spoon constantly turning, so that the dried tofu heat evenly, to prevent bending, so as not to bring inconvenience to the processing of the back, the whole process lasted about 2 minutes.
Fifth, crisping treatment. Crisp agent selection of sodium hydroxide, pure product is colorless transparent crystals, in the production of crispy tofu, selection of food-grade sodium hydroxide, soda ash. Chemical companies around the world are available.
In accordance with the size of the cement soaking pool or tank, determine the amount of water used, and thus the amount of alkali used. Requirements for the soaking pool of sodium hydroxide weight percentage concentration of 0.4% to 0.5%. First use a small amount of cool water in the basin to dissolve sodium hydroxide, and then poured into the pool or tank can be stirred.
Drain the floating oil of the puffed dried tofu into the pool or tank to soak. Soaking time is: 12 hours at 20 ℃ above; 20 ℃ below, soak 16 ~ 38 hours, until the dried tofu becomes soft and crispy, eat full of water until.
Six, neutralization rinsing. The role of neutralization rinsing is to set, further crisp and neutralize the excess sodium hydroxide. Neutralizer selection of food-grade acetic acid, can also be used instead of vinegar, vinegar in about 4% to 10% of acetic acid, can also be used as a neutralizer.
The concentration of aqueous solution of acetic acid liquid is 1-2%, that is, 50 kg of water into 0.5-1 kg of acetic acid or into 5-10 kg of vinegar. Soaking time: at 20 ℃, about 2 to 5 hours, in high or low temperatures, may be appropriate to shorten or extend the soaking time.
Seven, clear water rinsing. Clear water rinsing facilities and crisping facilities, clear water rinsing time of 2 to 5 hours, pH value of 7 can end rinsing. After rinsing the crispy tofu to dry the surface water, can be packaged and marketed.