What item is used to thicken the custard sauce before folding in the whipped cream when making Bavarian creams?

Using gelatin to thicken custard sauce before folding in whipped cream when making Bavarian creams is essential because it provides a stable structure to the final dessert. Gelatin helps achieve a firm yet delicate texture that retains its shape after chilling, which is crucial for Bavarian creams since they are set desserts.

The process involves blooming the gelatin in cold water, then dissolving it in warm custard. When the custard cools slightly, it is folded with whipped cream, creating a light and airy texture. This method ensures that the whipped cream maintains its volume and does not deflate, resulting in a smooth and creamy dessert that is not overly thick.

In contrast, other thickening agents like flour or cornstarch would create a different texture and may not yield the desired lightness. Butter, while enriching a sauce, does not have thickening properties suitable for this purpose. Therefore, gelatin is the preferred choice for ensuring the right consistency and overall quality of Bavarian creams.