Niai (Sweet-Sour Simmered Root Vegetables)
Vinegar is added only at the very end, so a sweet soy simmer of burdock, carrot, lotus root, shiitake, shirataki, and fried tofu picks up a bright sour note while the lotus root keeps some crunch. It comes from around Mito in Ibaraki, and one theory traces the name to nite aeru, to simmer and then dress. Families made big batches for New Year and ceremonies and ate it the next day, and it still tastes best after a night in the refrigerator.