Every summer, when the day is the hottest, many people in Kaifeng will cook the soybeans and ferment them, mix them with watermelon, pepper water, salt, etc. and make them into soybean sauce, and put them under the sun, and then they become a small dish with unique flavor in about 10 days. Since the opening of the Taobao store, has been looking for watermelon sauce, that is, we Kaifeng people say soybean, there are many years away from home in Henan people most want to eat the hometown dishes is he. It is said that Beijing's soybean sauce is Kaifeng passed over, Kaifeng soybean sauce to Mojia the most famous. The Eight-Power Allied Forces attacked Beijing, Zixi escape with people until the foreigners and peace, only to return to the capital, back to the capital on the way to Kaifeng, Henan governor Song Shou bent on flattering Zixi Empress, looking for delicacies, rare beasts killed to honor the old Buddha, which knows that the old Buddha did not care, that Song Shou thieves heart and soul, on some Kaifeng special watermelon sauce to the Empress, the Empress only showed a smile. That was just after the fall, the day is not cold, one day at lunch, Song Shou to the Empress on the new sun into the watermelon bean sauce for the Empress to taste, the Empress see the bean sauce red slippery, loose chopsticks to taste, taste good on the steamed bread dipped to eat, while eating, said: "good food, good food". After returning to the capital, the dowager can not forget the Kaifeng bean paste, want to eat but not to can unload the head of the kitchen, eunuch Li Lianying kneeled down and said: "watermelon bean paste is the Kaifeng folk often eat small dishes, the capital can be no one will do." Cixi was very unhappy, the eunuch busy with people down to look for people who will do watermelon bean sauce, many days later to find a countryman from Kaifeng, and went through a lot of trouble to find a watermelon to make a watermelon bean sauce, the old Buddha is happy again. Later, this method of making bean paste in Kaifeng spread in the capital watermelon sauce after the sun, add some peanut kernels, scallions, garlic, green and red chili peppers, stir-fried in a pot with a little oil, dipped in steamed buns to eat, the flavor, absolutely!