Brewing cold brew is easy, and one of the easiest methods to do it with is the Immersion Method. However, there are other ways to do it, for example using the cold brew hot bloom method.
What Is the Cold Brew Hot Bloom Method?
The hot bloom method is a way of making cold brew using hot water in the first seconds of the brewing process. Add your coffee grounds to a cold brew maker (for example this one) and pour hot water over it. Not too much. Wait for 30s and add then add cold water. Let it cold brew for 12-24hrs.
Why Use the Hot Bloom Method?
The idea behind the hot bloom method is that the hot water will extract much more aroma from the coffee and intense the flavors. Depending on how long you wait before you add the cold water, the flavors will become more or less powerful.
Cold brew coffee is normally low on acidity. Approximately 67% lower. But by starting the brewing process with hot water, a lot more acids will be released into the water and the end product will taste more and more like iced coffee. Again, it depends a lot on how long you wait before you add the cold water.
When to Use Hot Bloom for Cold Brew?
If you enjoy your cold brew, the hot bloom method might be a bit sharp in taste and doesn’t have that smoothness most cold brew drinkers seek. However, if you want to make a cold brew drink using milk, the hot bloom method might the perfect fit. For example this salted caramel cold brew recipe.
Caffeine Content for Hot Bloom Cold Brew?
Almost 90% of the caffeine is released from the coffee the first minute while hot brewing. Cold brewing extracts about 80% during the whole cold brewing process. Therefore, it is most likely that using the Hot Bloom method for your cold brew will increase the caffeine content slightly.
As mentioned before, it all depends on how long you let the hot water brew. If you wait more than 1min before adding the cold water, more than 90% of caffeine will be extracted. If you are just waiting for 10s, the number is probably somewhere between 80% – 90%.
Is There Any Guide For the Hot Bloom Brewing?
Yes, there is a video guide for cold brewing here on DripBeans. I am showing three different methods and one of these is the Hot Bloom method (minute 2:40).
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Hot Bloom FAQ
What is hot bloom cold brew?
It is a cold brewing method using hot water in the first seconds of the brewing process. This in order to extract more coffee flavors.
Is the hot bloom method caffeine content higher?
Yes. Hot bloom will extract more caffeine than normal cold brew. But the difference is small and cold brew already contains a lot of caffeine.
How much coffee for hot bloom?
How much coffee depends on how much water. Hot bloom is more powerful so you use less coffee than for normal cold brew. Suggested ratio 1:16. One part coffee, 16 parts water.
Is there a hot bloom recipe?
Hot bloom cold brew is easy. Take a cold brew maker (or a french press or a mason jar) and add 30g coffee to the brewer. Pour in 1 cup of boiling water and wait 30 seconds. Then add 1.5 cups of cold water and let it brew for 12-24hrs. Adjust coffee-to-water ratio after taste.