Going bananas for chocolate

Friday, 08 April, 2022

Going bananas for chocolate

The global chocolate confectionery industry is currently worth around $100 billion. Cocoa farmers produce approximately four million tonnes of cocoa beans each year and the world’s average chocolate consumption per person amounts to almost a kilogram per year.

Could a millennia-old process and an ancient secret ingredient be reasons why chocolate is so tempting across the globe?

According to UNSW food microbiologist Associate Professor Jian Zhao from UNSW School of Chemical Engineering, despite advancements in research and manufacturing, the basic chocolate production process has remained largely the same for thousands of years.

The ancient process

Chocolate production starts with cocoa. Each cocoa tree can bear approximately 1000 beans a year, which is typically enough to make one kilogram of chocolate.

Growing cocoa is notorious for being very labour-intensive, requiring plantation workers to cut the pods with machetes by hand.

Once the pods are ripe, they are harvested, and the cocoa beans are removed and placed in a pile covered with large banana leaves. This is called the fermentation stage and allows the beans to break down, A/Prof Zhao said.

“The fermentation stage takes about five to eight days depending on the climate,” he said.

“During this process, the flesh of the cocoa beans decomposes and lots of flavouring compounds are produced. This part of the process has a huge impact on the taste of the final product.

“Once the beans are fermented, they are dried in the sun for several days, packed and shipped to chocolate manufacturers all over the world.”

At the manufacturing plant, the dried cocoa beans are firstly roasted, which helps the bold colours and flavour of the bean to fully develop. The beans are cracked open and the ‘nibs’ — the small pieces of crushed cocoa bean — are extracted and ground up to produce a cocoa liquor.

Depending on the manufacturer’s formula, milk and sugar or more cocoa powder can then be added to achieve the desired taste.

“This is where chocolate makers get creative and what really sets them apart from each other,” A/Prof Zhao said.

A/Prof Zhao says understanding the science of chocolate has helped develop modern ways to improve the consistency during the fermentation process.

“We know that cocoa pods are still harvested by hand and the beans are dried on banana leaves on the ground — they still do things the traditional way so there is little control in things like hygiene,” he said.

“We’re trying to understand what microbes are important to achieve that chocolate flavour we all know and love so we can develop microbes into static cultures.

“We then use these static cultures to transform the fermentation process into a more controlled industrial process — that’s the goal.”

What’s your flavour?

A/Prof Zhao said that while two brands of chocolate might source their cocoa beans from the very same plantation, there can be a significant difference in taste through the production process.

“One chocolate maker might do everything manually and another might have different ratios of milk and sugar they add to it,” he said.

“Even if you source the same beans from the same plantation, that doesn’t mean you’re going to get the same-tasting block of chocolate at the end.

“It’s like wine. A bottle of red wine produced by different winemakers but from the same grapes will still taste different — even if they’re both the same type of wine.

“Some people will say Swiss chocolate is the best and others will say Belgian chocolate is superior, but it comes down to your own personal preference and taste buds.”

Image credit: ©stock.adobe.com/au/dmitr1ch

Originally published here.

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