Whipped ganache is applied to a cake by spreading it evenly and smoothing it with a bench scraper.
Here's a step-by-step breakdown based on the video's description:
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Spread the Ganache: Apply the whipped ganache around the cake.
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Smooth the Top: Use a flat bench scraper to smooth over any raised areas in the middle of the cake.
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Fill in Gaps: Use the ganache to fill in any gaps on the sides of the cake.
In essence, the technique focuses on even distribution and a smooth finish achieved with the right tools.