What is the purpose of pre-warming the kettle, dripper, and server before brewing?
Answer
To prevent immediate thermal energy robbing from the brew water upon contact.
When brewing coffee, thermal stability is crucial for consistent extraction. If the brewing apparatus (dripper and server) or the kettle itself is cold (e.g., ceramic or glass), the hot brew water immediately transfers a significant amount of its thermal energy into the cold surfaces upon contact. This momentary, steep drop in temperature right at the start of the infusion can compromise the solubility of desirable compounds, leading to a subpar extraction. Pre-warming mitigates this effect, ensuring the brew water maintains its intended temperature from the first drop.
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