Sakura ebi are about as small as a shrimp gets while still being worth catching: translucent, faintly pink, roughly the length of a fingernail, hauled in quantity from the deep water of Suruga Bay off Shizuoka. They taste of the sea in a concentrated, slightly sweet way, and they are almost never eaten one at a time. The Shizuoka sakura ebi sando takes that local catch and folds it into a sandwich that is unmistakably regional, the sort of thing you notice on a station kiosk in Shizuoka and nowhere much else.
The most common treatment is kakiage: a loose tangle of the tiny shrimp bound with a thin batter and fried into a flat, lacy fritter that shatters at the edges and stays chewy at the center. That fritter goes between bread while it still has some crunch, which is where the craft lives. The bread is usually soft shokupan, sometimes a split roll, and the contrast is the entire point: yielding crumb against crisp, briny fritter. A good one is assembled close to when it is eaten, so the kakiage keeps its texture and the bread has not gone damp from frying oil. A poor one sits too long, the fritter softens into something limp and greasy, and the shrimp flavor muddies instead of singing. A swipe of mayonnaise or a little shredded cabbage often goes in to bridge the two, and the seasoning stays light because the shrimp themselves carry plenty of salt and depth.
Not every version fries the catch. Some kitchens fold the shrimp into a mayonnaise-bound salad, more in the manner of a deli filling, which trades the crackle for a cleaner, cooler bite that lets the sweetness of the sakura ebi come through unobstructed. Others scatter them whole over a softer base where they read almost as a garnish with the salt left intact. The fritter version is the one most people picture, and it is the one that feels most tied to the bay it comes from.
Geography is doing a lot of work in this sandwich. Suruga Bay is one of the few places these shrimp are landed in volume, so the sando functions partly as an edible souvenir, something a traveler picks up because it tastes of a specific stretch of coast rather than because it is the most refined thing on the shelf. That regional anchoring is its charm and also its limit: it is rarely the most polished sandwich in a Shizuoka case, but it is one of the few that could not plausibly come from anywhere else. The wider story of Japanese regional seafood sandwiches and the kakiage tradition behind them deserves its own article rather than being crowded in here.