Diferença entre Esponja, Poolish, Biga e Levain | Pré-Fermentos

Understanding Pre-ferments in Bread Making

Introduction to the Speaker and Topic

• Catarina Riz introduces herself as a specialist in natural fermentation with a background in gastronomy and nutrition, sharing her expertise on bread production and types of yeast.

• The focus of the video is to explain the differences between various pre-ferments: esponja, polish, biga, and levã.

What is Pre-ferment?

• Pre-ferment is defined as a fermented dough used in bread or pizza preparation that enhances flavor and aids gluten breakdown while activating microorganisms.

• Different recipes may call for different types of pre-ferments (esponja, polish, biga), primarily differing in water content.

Types of Pre-ferments

Esponja

• Esponja involves mixing a small amount of flour and liquid to activate yeast quickly; it can take 15 minutes to 2 hours for activation.

Polish

• Polish requires equal parts flour and water (e.g., 100g each), along with a small amount of dry yeast. It’s prepared separately from the main recipe ingredients.

Biga

• Biga is denser than polish, using half the water compared to flour (e.g., 100g flour with 50g water). It results in a heavier dough requiring longer fermentation (12 to 16 hours).

Levã

• Levã differs significantly as it does not use commercial yeast but is made from scratch using flour, water, and a starter like fruit juice or yogurt. It takes about 7 to 10 days to develop.

Key Differences Among Pre-ferments

• Unlike other pre-ferments that utilize industrial yeast, levã relies on naturally occurring microorganisms cultivated over time.

Practical Applications

Usage Insights

• Esponja serves well for basic recipes without adding much flavor; it's quick for activation.

• Polish can substitute levã when making bread if one hasn't developed their natural starter yet. It's effective for achieving similar texture and quality.

How to Prepare Biga, Polish, and Levain for Baking

Introduction to Dough Preparation

• The speaker discusses the importance of using biga in baking, particularly for Italian products like panettone, which require a stronger gluten structure.

• Emphasis is placed on the process of making a sponge (esponja), polish (pulish), and biga as foundational steps in bread-making.

Ingredients and Measurements

• A scale is essential for measuring ingredients accurately: water first, followed by yeast, then flour. This order helps activate the yeast effectively.

• The sponge requires a larger amount of yeast compared to standard recipes; if a recipe calls for 5g of yeast, that’s what should be used. Adjustments can be made based on liquid measurements.

Making the Sponge

• To create the sponge, mix a portion of water or milk with an appropriate amount of yeast and flour until it forms a paste-like consistency; there are no strict measurements here.

• The texture should resemble that of pish but with more yeast to ensure quicker activation and growth. After mixing, label it for identification later.

Preparing Polish

• For polish preparation: if 100g is needed in total, use equal parts—50g each of water and flour—with just a pinch (about 1g) of yeast added to slow down fermentation time for flavor development.

• The slower activation process allows for enhanced flavor and texture differences compared to faster methods like sponge preparation. It typically takes about 12 to 16 hours to activate properly.

Understanding Biga

• When preparing biga: use a ratio of 100% flour to 50% water; thus if using 50g water, you need 100g flour along with some yeast mixed in thoroughly despite its drier consistency compared to other mixtures.

• Biga results in a much drier dough that may require more effort to mix; some bakers prefer using mixers due to its stiffness during preparation.

Observations on Fermentation

• After fermentation periods: levain shows significant bubbling indicating readiness while sponges may lose strength after their peak but can still be utilized effectively even after extended times like 12 hours post-preparation.

Understanding Pre-Ferment in Baking

Overview of Pre-Ferment

• The lesson concludes with a demonstration of how well the pre-ferment fills the container, indicating successful fermentation.

• Observations include visible bubbles in the mixture, showcasing active fermentation and growth.

• The natural yeast has effectively fed on the ingredients, leading to a robust rise in all components.

• The instructor encourages participants to choose which type of pre-ferment they wish to use for their baking projects.

• A final note expresses hope that viewers have learned about pre-ferments and their application in baking.