When making caramel, heating the cream before adding it to the sugar does make a significant difference and is generally worth the extra step. The main benefit of using heated cream instead of cold cream is that it helps to prevent the caramel from seizing or crystallizing.
When you add cold cream to hot caramelized sugar, the temperature difference can cause the sugar to solidify and form clumps, resulting in a grainy texture. By heating the cream before adding it to the sugar, you ensure that the ingredients are closer in temperature, minimizing the risk of crystallization and producing a smoother, more consistent caramel sauce or caramelized sugar.
Additionally, heating the cream helps to dissolve any residual sugar crystals that may be present in the cream itself. This further prevents the formation of unwanted crystals in the caramel.
-> Heating the cream before adding it to the sugar when making caramel helps to create a smoother texture and reduces the likelihood of the caramel seizing or becoming grainy. It's a small extra step that can make a noticeable difference in the final result of your caramel recipe.