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How did London porter brewers create porter in the 18th century?

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Six small glasses of craft beer in varying amber and golden hues are arranged on a metal tray atop a wooden bar counter in Brussels, Belgium. — Beer Glasses of beer in a bar in Brussels.

In the 18th century, London brewers departed from the traditional practice of creating successive extracts from a single batch of brown malt to produce porter. Instead, they created this style by using a mixture of malt extracts.1

This innovation resulted in a strong, dark-colored, and highly hopped beer that evolved from the English brown ales of the time. The resulting beverage became a favorite among the transportation workers of Central London, from whom the beer derived its name.21