What did tempura become popular as at Edo outdoor food stalls?

At Edo outdoor food stalls, tempura became popular as fast food. Vendors could fry battered seafood and vegetables quickly, then serve them hot to customers who ate at or near the stall.

The setting mattered. Edo was a large urban center, and fresh seafood from Tokyo Bay was plentiful. Oil extraction also improved, making cooking oil more affordable. Since deep-frying indoors was considered a fire hazard in buildings made largely from wood and paper, outdoor stalls offered a practical place to prepare tempura. It was often skewered and eaten with a dipping sauce.

Tempura’s later reputation as refined restaurant cuisine can obscure this earlier street-food identity. During the Edo period, it was associated with convenient, informal eating alongside foods such as soba and sushi. After the Meiji period, tempura increasingly moved into restaurants and developed into a high-class cuisine. It therefore has both a fast-food history and an elite culinary tradition.