Fermented Soy Foods. Fermented Soy Food Recipes. In Chinese cuisine, tofu may also be salted or pickled. Salted dried tofu is firm and dark brown color (doufu-kan) and fermented, preserved or pickled tofu (doufu-ru, furu, rufu, fuyu, funan) is aged tofu with a soft, creamy texture and an aroma to a very ripe cheese.