What is yeast cake?

Yeast cake is a concentrated form of active dry yeast. It's a solid block of compressed yeast that's typically sold in a sealed foil package.

Here's how it differs from other forms of yeast:

* Active Dry Yeast: This is the most common type of yeast, available in granular form. It needs to be rehydrated in warm water before use.

* Instant Yeast: This is a type of active dry yeast that doesn't need to be rehydrated. It can be added directly to dry ingredients.

* Yeast Cake: This is a solid block of compressed yeast that is more potent than active dry yeast. It needs to be crumbled and dissolved in warm water before use.

Why use yeast cake?

* More potent: Yeast cake is a more concentrated form of yeast, so you need less of it compared to active dry yeast.

* Longer shelf life: Yeast cake can stay fresh for longer than active dry yeast, especially if stored properly.

* Better for some recipes: Some recipes, such as sourdough bread, require the use of yeast cake.

How to use yeast cake:

1. Crumble: Crumble the yeast cake into a bowl of warm water (around 105-115°F).

2. Dissolve: Stir the yeast and water mixture until the yeast is completely dissolved.

3. Let bloom: Let the yeast mixture sit for 5-10 minutes to allow the yeast to activate.

4. Add to your recipe: Once the yeast is foamy, you can add it to your recipe as instructed.

Tips:

* Always check the expiry date. Yeast cake can lose its potency over time.

* Store in the refrigerator. Store yeast cake in the refrigerator for longer shelf life.

* Don't use expired yeast cake. Expired yeast cake won't activate properly and your bread won't rise.

Overall, yeast cake is a great option for bakers who need a concentrated and long-lasting form of yeast. While less common today, it's still available and can be a useful ingredient for certain recipes.