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1
Whisk the eggs, double cream, vanilla extract, and honey together in a wide, shallow dish until fully combined and uniform. Allow the custard to reach room temperature if it has been refrigerated — room-temperature custard penetrates the bread's crumb more readily than cold. Lay the shokupan slices in the custard in a single layer, cover, and refrigerate overnight (or for a minimum of several hours). Turn the slices once during soaking. The bread is ready when it has absorbed custard to its centre and feels uniformly weighted and soft throughout — no dry resistance at the core when pressed gently.
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2
Remove the soaked slices from the custard and allow any excess to drain briefly. This is where the dish lives or dies: set a heavy oven-safe pan over high heat and melt a portion of the butter until it foams and begins to subside. Place the slices in the pan and cook without moving for 1–2 minutes per side, until each face is deeply golden and a caramelised crust has formed — this exterior colour and slight crispness cannot be achieved later and cannot be recovered if missed. The crust must be a true deep amber before the heat is reduced.
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3
Reduce the heat to low immediately after both faces are caramelised. Continue cooking on the stovetop for 2–3 minutes, turning once, allowing the interior custard to begin setting without further darkening the crust. The sides of the slice should lose their raw, wet sheen.
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4
Transfer the pan to an oven preheated to 160 °C and finish for 8–10 minutes. The oven heat cooks the custard interior evenly without burning the caramelised exterior. The slices are done when they have risen very slightly, hold their shape without collapsing when lifted, and the interior — when tested with a skewer — is barely set and soufflé-soft rather than firm.
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5
Plate each slice immediately. Place a portion of Hokkaido butter on the hot surface and allow it to melt tableside. Serve maple syrup, a spoonful of jam if using, and a scoop of ice cream alongside. Garnish is kept minimal — the bread and custard are the subject of the plate.