What Defines Leavening?
Just what is leavening?
To understand leavening, we must look at the meaning of the words in Hebrew.
Exodus 12:19 “Seven days shall there be no leaven (H7603) found in your houses: for whosoever eateth that which is leavened (H2557), even that soul shall be cut off from the congregation of Israel, whether he be a stranger, or born in the land.”
According to Strong’s, H7603 = seor = is defined as, “barm or yeast-cake (as swelling by fermentation).”
According to the Merriam-Webster Dictionary, barm is defined as “yeast formed on fermenting malt liquors.”
We see here that seor refers to an old piece of dough that is highly fermented. It’s a piece of dough that is allowed to ferment to the point of becoming sour or acidic and then used to leavenanother piece of dough.
According to Strong’s, H2557 = chamets = is defined as, ferment, (figuratively) extortion: - leaven, leavened (bread).
So we see that chamets is not a leavening agent, but is leavened bread, a product produced from the leavening. It is any grain product that has been leavened.
The following agents are considered leaven:
- Yeast, known as fresh, compressed, or cake yeast
- Sourdough starter
- Active dried yeast, consists of coarse oblong granules of yeast, with live yeast cells encapsulated in a thick jacket of dry, dead cells with some growth medium. Under most conditions, active dry yeast must first be proofed or rehydrated.
- Rapid-rise yeast, is a variety of dried yeast (usually a form of instant yeast).
- Instant yeast, appears similar to active dry yeast
The following list is not considered leavening by themselves, but are considered leavening only when found in a product:
- Baking powder: is a complete leavening agent, meaning it contains both the base (sodium bicarbonate) and acid needed for the product to rise once it’s combined with a liquid.
- Baking soda: becomes activated when it’s combined with both an acidic ingredient and a liquid. Upon activation, carbon dioxide is produced.
- Cream of tartar: (potassium bitartrate), when combined with baking soda, it becomes a leavening agent by producing carbon dioxide gas.
- Sodium bicarbonate: also known as “Saleratus.”
- Potassium bicarbonate: or potash.
- Ammonium carbonate: or “baker’s ammonia.”
- Ammonium bicarbonate: also known as “hartshorn.”
- Autolyzed yeast: A yeast that has ‘self-destructed’ and is sterile – incapable of leavening.
- Brewers Yeast: A dead form of yeast that cannot leaven bread; a ‘nutritional’ yeast.
- Deactivated yeast: is dead yeast which has no leavening value
- Torula Yeast: A dead yeast that cannot leaven bread, considered a ‘nutritional’ yeast. Also hickory smoked torula yeast. Used as a savory seasoning that imparts smoky aroma to foods.
- Yeast extract(s): Derivatives of yeast, which are sterile and cannot leaven bread.
- Tartrate powder: Phosphate powder or sulfate powder – usually added with cream of tartar.