Why does caster sugar have to be in a cake?

* Sweetness: The most obvious reason is to add sweetness to the cake. It's a basic ingredient that balances out the other flavors and provides a pleasing taste.

* Structure: Sugar helps create the structure of a cake by reacting with the gluten in the flour. This results in a tender and airy crumb.

* Moisture: Sugar absorbs moisture, which helps keep the cake moist and prevents it from drying out too quickly.

* Color: Sugar caramelizes during baking, giving the cake a lovely golden-brown color.

However, you can definitely make cakes without caster sugar:

* Substitute other sweeteners: Honey, maple syrup, agave nectar, or even fruit purees can be used to add sweetness.

* Reduce sugar: Many recipes allow for a reduction in sugar without compromising the cake's texture.

* Go sugar-free: While sugar-free cakes might not be as sweet, they can still be delicious and enjoyable.

Ultimately, the choice of whether or not to use caster sugar in your cake depends on your personal preferences and dietary needs.