Laotan Sauerkraut Beef Noodles is made from mustard greens with a ratio of 1:1 to the stems and leaves. The sauerkraut is crispy and has a strong sour flavor. The vegetables are dehydrated using natural ancient methods and then dried. The vegetable layer is stored in the salt cellar. After nine, ninety and eighty-one days of fermentation, it is once again put into the traditional pottery jar and the old brine for the second fermentation to produce the authentic sour taste. The marinated sauerkraut is paired with small yellow ginger, two vitex or horn pepper and secret red oil to make the noodles full of flavors. Every bite is sour and spicy, salty and spicy. It is one of the most famous beef noodles in China.