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The main function of fat in baking is to retain the gases released during baking. Fat also helps the browning of the outside.

In bread making fat provides flavour but more importantly lubricates the dough. This helps to retain the gases released during baking thus ensuring a well risen loaf which will have a soft crumb and will stay fresh longer.

Biscuits and pastry are made with "shortening ". The fat is rubbed into the flour. The molecules of fat surround the flour particles and exclude water. This prevents the development of gluten in the dough. The fat is said to shorten the dough. A increase in water in the mixture by using the wrong type of margarine will encourage development of gluten, which will make biscuits hard and pastry heavy and get soggy after baking.

In cakes fat has different functions as they are usually made by either the creaming method or the all in one method. In the creaming method the fat is beaten with the sugar until it becomes light, fluffy and pale in colour as the sugar dissolves and air is being incorporated increasing the volume. The air is important as it makes places into which other gases, and water vapour from the moisture and carbon dioxide from the baking powder, migrate and expand on heating.

In the all in one method The fat has no aeration function but as in bread making it will help to retain the gases released during baking.

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