Ma Po Eggplant in Garlic Sauce
Why the eggplant is blue purple color? Because it has the anthocyanin-based dye.
The anthocyanin-based dye is soluble in water.
It has the property of changing to red in acidic and to blue in alkaline. Additionally it is an unstable substance, color is likely to change in heat , light, additives , or the like.
And add chicken soup, doubanjiang, miso, soy sauce and Shaoxing rice wine
is a eggplant. 茄子（なす） literally uncertain, there are some story in its origin.
is a Katakuri starch originally, which is made of root of Japanese dog’s tooth violet. However now is mostly potato starch. 片栗粉（かたくりこ） literally “Katakuri powder”