Ibaraki Prefecture (Mito) — though consumed across eastern Japan
Natto (納豆) is fermented soybeans inoculated with Bacillus subtilis var. natto, producing the characteristic stringy, sticky mucilage (polyglutamic acid) and deeply savory, ammoniated flavor beloved in eastern Japan, reviled elsewhere. Mito (Ibaraki) is historically considered natto's capital. While most natto is consumed simply over rice with mustard and soy, professional applications are increasingly sophisticated: natto pasta, natto pizza (Tokyo trendy), natto vinaigrette for salads, and natto incorporated into miso for complex layered fermentation. The strings (neba neba) become less pronounced when natto is beaten vigorously — beating also activates nattokinase enzyme activity.
Intensely savory, fermented ammoniated depth with satisfying sticky texture — acquired taste
{"Beating natto 50-100 times develops strings further and 'activates' the flavor","Serve at room temperature — cold natto has muted flavor and thicker, less pleasant texture","Mustard (karashi) cuts through fermented intensity; soy sauce adds salinity","Natto strings reduce significantly when incorporated into other ingredients","Strong flavor pairs: kimchi, takuan, mentaiko — layer fermented-on-fermented flavors","Avoid cooking natto at high heat — nattokinase enzyme degrades above 70°C"}
{"Natto ochazuke: hot tea over rice with natto, wasabi, and nori — the strings dissolve slightly","Natto and negitoro: mix finely chopped fatty tuna (negitoro) with natto — rich, funky, excellent","Natto pasta: olive oil, garlic, natto, grated daikon, yuzu — pan without heating the natto","Hikiwari (crushed) natto: smaller pieces, milder flavor — better for mixing into preparations","Natto vinaigrette: blend natto with rice vinegar, miso, sesame oil, honey"}
{"Eating straight from refrigerator — cold deadens the flavor profile significantly","Not beating sufficiently before eating — fewer beats means less developed flavor","Combining with oil or cream without balancing acidity — nattokinase-oil can taste heavy","Overcooking natto in recipes — texture and characteristic enzymatic activity both degrade"}
Japanese Fermentation — Ibaraki Natto Producers; Natto Culture documentation