The beans are then soaked in very hot - non boiling - water for several minutes.
This is an essential part of the process. Not only does it stop organic changes within the bean and prevent it from splitting open, but it is also crucial, ultimately, to the vanillas flavor. A bean that has not been cooked long enough will never become brownish or black, whereas one that has been cooked too long will become yellow.
The hot beans are covered with layers of canvas sacking and sealed in wooden cases for a period of up to 48 hours during which they become darker. The heat and humidity retained within the cases contribute to a natural metabolic process that will develop vanillas typical aroma.
The beans are still piping hot when they are finally removed from the cases.
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