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Starch thickeners require continuous agitation during the initial phase to prevent uneven hydration and scorching at the bottom of the pan. When preparing dairy-based puddings, whisking the flour thoroughly with cold milk before introducing it to the simmering liquid prevents the formation of dense, gelatinous lumps.
A heavy-bottomed saucepan distributes medium heat evenly across the cooking surface, reducing the risk of burning the milk solids. Maintain the heat at a moderate level so the mixture thickens gradually over a ten to fifteen minute window. If the cream scorches, transfer the unburned portion to a clean vessel immediately to avoid imparting a bitter taste to the entire batch. Glass or ceramic baking dishes measuring 25x25 cm provide optimal thermal mass for setting layered desserts.