1 Yeast and Starters Yeast and Starters Yeast Yeast • Yeast is found everywhere in nature • 500 different kinds • Baker’s yeast is one species: Saccharomyces cerevisiae • Yeast is a living organism • It is unicellular • Yeast has the ability to ferment carbohydrates once they are simple sugars Fermentation Fermentation Definition: The chemical process in which the enzymes naturally present in yeast convert sugars to a gas and alcohol Yeast Yeast Yeast is living and therefore requires several things in order to perform properly: • Moisture • Food • Temperature • Correct pH • Time • Structure Functions of Yeast Functions of Yeast • Leavening • Maturing the dough • Flavor • Aroma Types of Yeast Types of Yeast Compressed • 70% moisture • 2-3 weeks in fridge • 3-4 mths in freezer • Dissolve in 80F-90F water 1& 1/2 tsp.
5
Embed
Yeast Yeast and Starters - Cabrillo Collegekniven/CAHM166/StartersSlides.pdf · 2 1/2 cup bread flour 3/4 cup water + 2 TB. 1/2 tsp. instant yeast POOLISH 2 1/2 cups bread flour 1
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
1
Yeast and StartersYeast and StartersYeastYeast
• Yeast is found everywhere in nature• 500 different kinds• Baker’s yeast is one species:
Saccharomyces cerevisiae• Yeast is a living organism• It is unicellular• Yeast has the ability to ferment carbohydrates
once they are simple sugars
FermentationFermentation
Definition:
The chemical processin which the enzymesnaturally present inyeast convert sugars toa gas and alcohol
YeastYeast
Yeast is living andtherefore requiresseveral things in orderto perform properly:
• Any sourdough,sponge or yeastedpiece of dough that isincorporated into anewly mixed breaddough to boostfermentation
StartersStarters
• Sponge starter• Most basic: All the liquid in a recipe, enough flour to
make a pancake like batter• For a quick rise, add all the yeast to the liquid and flour.• For a longer rise, add 1/3rd of the yeast amount• NO SALT, NO FAT• Let rise till active and bubbly, then add rest of
ingredients• The less yeast you use and the longer you let it rise the
more flavorful the resulting bread
PoolishPoolish
Type of sponge methodusing less yeast
French-style pre-ferment Much wetter < 1% commercial yeast For 2# dough 1/4tsp.
Yeast• Why? Improved flavor,
texture, shelf life, moreflexibility to risingschedules
3
PoolishPoolish
• Soupy texture• Like pancake batter• Usually equal parts flour
• A piece of fermenteddough left over from aprevious batch
• This starter is added toa new batch of doughto give more depth offlavor
Sourdough StarterSourdough Starter
• Natural leavening of wild yeast(Saccharomyces exigus) and bacteria(Lactobacillus san francisco) captured in amixture of flour and water
• Several starters can be used to capture thesewild yeasts: rye flour, honey, organicgrapes, cumin
• It takes 10-14 days to build and then use anew sourdough starter
Sourdough StarterSourdough Starter
• Saccharomyces exigus does not ferment maltosebut ferments the other carbohydrates present inflour - glucose, fructose, glucofructosans
• It also thrives in an acidic environment• Lactobacillus san francisco does ferment maltose
and produces acids that characteristically flavorthe bread
• Sourdough takes at least three days to makeincluding building the starter
4
Sourdough StarterSourdough Starter
1 2
3 4
Sour Dough ProjectSour Dough Project
You need to keepYou need to keepa daily diarya daily diary(legible).(legible).
Sour Dough ProjectSour Dough Project
You will beYou will besuppliedsuppliedpineapple juice,pineapple juice,diastatic diastatic maltmaltpowder, and flourpowder, and flour
Sour Dough ProjectSour Dough Project
You will need toYou will need tosupply your ownsupply your ownspring water (orspring water (orfiltered water).filtered water).
Sour Dough ProjectSour Dough Project
You need to keep aYou need to keep adaily diary (legible) ofdaily diary (legible) ofwhat you didwhat you did(refreshments and(refreshments andtimes) and how yourtimes) and how yourstarter looks, acts,starter looks, acts,and smells.and smells.
Sour Dough ProjectSour Dough Project
Day 1 - 2:Day 1 - 2:
Mix pineapple juice,Mix pineapple juice,
Wheat flour and maltWheat flour and maltpowder. Stir 2-3powder. Stir 2-3times a day. It istimes a day. It isimportant to addimportant to addoxygen to theoxygen to themixture.mixture.
5
Sour Dough ProjectSour Dough Project
Day 3-4:Day 3-4: Fermentation, Fermentation,add new refreshmentsadd new refreshments
Day 4 or 5:Day 4 or 5: Refreshing Refreshingthe culture add waterthe culture add waterand flourand flour
Day 5 or later:Day 5 or later: Discard Discard1/2 the sponge and1/2 the sponge andadd more water andadd more water andflour. Fermentationflour. Fermentationshould be happeningshould be happening
Mother sponge:Mother sponge:Building the starter.Building the starter.Mix 2/3 cup of theMix 2/3 cup of theseed culture from dayseed culture from day5 or later with 1 cup5 or later with 1 cupwater and 2 1/3 cupswater and 2 1/3 cupsflour. It should rise atflour. It should rise atleast 1 1/2 - 2 timesleast 1 1/2 - 2 timesits volume in 4 - 8its volume in 4 - 8hours. Refrigeratehours. Refrigerateovernight.overnight.
Sour Dough ProjectSour Dough Project
Your mother sponge is now ready to be the starterYour mother sponge is now ready to be the starterfor your bread.for your bread.
Feeding: Your sourdough will need to beFeeding: Your sourdough will need to berefreshed every so often 100 % flour: 75% water:refreshed every so often 100 % flour: 75% water:33.3% starter (3 oz flour: 2 1/4 oz filtered water33.3% starter (3 oz flour: 2 1/4 oz filtered water:1 oz starter). If you leave it more than 2 weeks:1 oz starter). If you leave it more than 2 weeksyou will need more than 8 hours to revitalize ityou will need more than 8 hours to revitalize itand you might need to refresh it a couple ofand you might need to refresh it a couple oftimes with more flour and water.times with more flour and water.
Sour Dough ProjectSour Dough Project
The project is dueThe project is dueJuly 6.July 6.
This means youThis means youwill turn in a diarywill turn in a diaryand actually bringand actually bringin the starter (noin the starter (nomatter what shapematter what shapeits in)!its in)!