Create a close-up image of the tiramisu assembly process. Focus on a layer of coffee-soaked ladyfinger biscuits arranged in a white rectangular dish. On top of the biscuits, there is a dollop of creamy mascarpone mixture. A flat metal spatula is in the process of spreading the mascarpone over the biscuits. The background is minimal, highlighting the texture of the biscuits and the smoothness of the cream.