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Dougan (Chinese: 豆干/豆乾 dòugān) is a firm variety of tofu (Chinese: 豆腐 dòufu) which is popular in China. It differs from regular tofu in that it is firm whereas tofu is soft.
It is composed of two syllables. Dòu (豆), and gān (Simplified Chinese:干 Traditional Chinese:乾). Dòu means bean, and gān means dry. This is different from tofu (which also has two syllables), but the second syllable in tofu is "fu" (腐).
It is important to distinguish between tofu and dougan, as it may not be appropriate to substitute tofu for dougan in recipes which call for dougan.
Dougan has less moisture content than tofu in that it is drier, and also by weight, where dougan has a greater bean to water ratio than tofu. This means that dougan contains more protein per gram, as the water density is less.