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1
Toast the bread until golden and crisp throughout, so that the crust has enough structural rigidity to carry the butter and Vegemite without sagging under the knife. The surface must be uniformly amber with no pale or soft patches — a soft interior is acceptable; a soft crust is not. Test by pressing the corner: it should resist and not yield.
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2
Remove the toast from the heat immediately and apply the butter generously across the full surface while the toast is still hot, so the butter melts flush into the surface and forms a single integrated layer rather than sitting on top as a separate mass. If the butter sits without dissolving, the toast has cooled too far and must be discarded. This is where the dish lives or dies: cold toast means the butter does not integrate, and Vegemite applied over solid butter will be overwhelming and structurally unsound.
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3
Using the flat of a knife, scrape — do not spread — an extremely thin layer of Vegemite across the buttered surface in a single pass, so that the salt and intensity of the paste is tempered by the fat beneath rather than concentrated in any one spot. The layer should be translucent where the butter shows through; any opacity indicates excess. Halve the quantity applied if uncertain.
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4
Eat immediately, so the crust delivers its sharp crack on the first bite before moisture from the spread has time to migrate inward and soften it. The butter-softened crust will begin to lose its crispness within minutes. When the crack is gone, the moment has passed.