Convex. According to the official website of Jushu Brand, it can be seen that under normal circumstances, Jushu Brand sesame oil and white fermented bean curd is bloated inside and the bottle cap is convex. This is because fermented fungi are added during the production process, and the fungi are alive. Causes the bottle cap to bulge. Jushu brand makes spicy fermented bean curd with sesame oil, which is a great accompaniment to meals, especially when paired with white porridge, fermented bean curd is definitely the first choice.