Yeast is a natural microscopic fungi that ferments other ingredients and, in the case of baking, helps doughs and other mixtures to rise. It comes in three main ready-to-use forms for the kitchen: fresh, dried and easy-blend.

Yeast is used for myriad breads and doughs, including pizza bases, sweet and savoury buns and some rich pastries.

Yeast batters are used for deep-fried fish, and occasionally pancakes and waffles.