Because of its rich flavor, for its excellent preservation, and low cost to produce, Tsukudani became widely popular as a side dish and became known as Edo specialty as well. The name Tsukudani, began to be used at the end of the Tokugawa shogunate era, and since it was well known as a Tokyo specialty, after the Meiji restoration, an ex-samurai opened up a Tsukudani store. During the war, there was high demand for it as the soldier’s preservation food, and because of that, the industry grew rapidly. As this happened, it becomes a familiar dish in the common family.
The common ingredients used in Tsukudani are fish such as bonito, tuna, gobi, pond smelt, small crucian carp, small sea bream, small flatfish, and young sardines. The shellfish used are such as littleneck clam, clam, oyster, and ark shell. Other dried sea products used are dried squid, kelp, dried seaweed, small fishes, and dried prawns. The nutritional value depends on its ingredients but for example, if it is made with fish, it is rich in protein, and because it is processed by boiling, it is also rich in various vitamins, calcium, iron and phosphorous.
At first, the soy sauce boiled ones were mainly produced, but recently, there are other variations such as sweet ones with sugar added, and ones with boiling fried ingredients.
There are also other variations of Tsukudani, which is processed differently, such as “shigureni” that is made with mainly shellfish, such as clams, that is boiled down with soy sauce, ginger, and Japanese pepper. This variation is widely spread in the Kansai area.
Another variation is “kanroni” which uses fresh water fish such as ayu, pond smelt, crucian carp, and rainbow trout, and boiled down with starch syrup and sugar, until there is no more watery portion. There is also “Ameni”, which is made by boiling down soy sauce, sake, and mirin, and after that boiling once again with adding starch syrup.
For the Japanese, who eat rice as a main diet, Tsukudani, which draws out the flavor of the rice and increase the appetite, is a must have.