Tsukiji Outer Market 築地場外市場
The wholesale auction moved to Toyosu in 2018, but the outer market - roughly 400 stalls of tamagoyaki, grilled scallops, uni, tuna skewers, dried goods, knives and ceramics - never left, and it is the best standing-and-eating breakfast in the city. A group of five should split up, buy across different stalls and share; that gets you fifteen things instead of five.
Tip: Roughly 05:00-14:00. CLOSED SUNDAYS, most public holidays, and CERTAIN WEDNESDAYS - the 2027 calendar is not published yet, so check tsukiji.or.jp before going. Individual shops set their own days on top of that. Best 07:00-09:00; by 10:00 the queues are 30 minutes. Hamarikyu Gardens is a 15-min walk.