Leavening agents
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Natural leavening agents
Yeast, Air and Steam
What does yeast need to live?
Food, Air and Warmth
What does yeast dough need to do before it goes in the oven so that the yeast works?
Rise or Proof at least once
Does fresh yeast need to be blended with liquid?
Yes
What kills yeast?
Salt
How do you store fresh yeast?
In a plastic bag in the fridge, saran wrapped, or in a lidded jar for 2-3 weeks.
When does fresh yeast freeze best?
When it is really fresh.
How do you know if fresh yeast is bad/sour?
Discolored, Moldy or Sticky.
What are the 2 forms of Dried Yeast?
• Traditional dried yeast/active yeast. 2. Instant dry yeast.
Does dry/active yeast need to be dissolved in water?
Yes.
Does instant yeast need to be dissolved in water?
No.
How long can dry active yeast be kept?
Up to 6 months in a cool dry place.
Does baker’s yeast produce a good wine?
No.
What temperature does yeast die ?
60 C
At what temperatures does yeast show no activity?
55-60 C and -20-0 C
What temperature is the optimum fermentation for yeast?
28-35 C
What temperature does yeast multiply well?
20-28 C
By what amount do you reduce the yeast if you are converting from fresh yeast to instant or active dry?
50%
What are 3 other types of yeast not used in pastry production?
• Wine/Beer Yeast. • Brewer’s Yeast or Tonic Yeast. • Yeast Extract
By what 2 methods can air leaven a product?
• Creaming method. 2. Foaming method.
How does air leaven a product?
By expanding during baking.
Briefly explain the creaming method
• Beat the fat and the sugar to incorporate the air. • Slowly add the liquid. • Add the dry ingredients.
What is the process of the foaming method?
It is the process of beating eggs with or without sugar to incorporate air.
What is leavened using the whole egg foaming method?
Sponge cakes