Tetsu Kasuya adapted his 4:6 method for the Hario Switch, using the valve to control extraction phases more precisely than open pour-over allows. The result is his characteristic split-phase approach with the added repeatability of immersion.

By keeping the valve closed during the first two pours (40% of water), Kasuya creates a deeper immersion bloom that pulls more sweetness from the grounds before opening for the strength-controlling second phase.

Medium to light roasts with pronounced sweetness or complexity. The method rewards the same bean profiles that respond well to the original 4:6 recipe on an open V60.

• Tip: Follow the same 40%/60% split as the standard 4:6 method. The Switch's valve controls when each phase drains, not how much water is used.
• Tip: Keep the valve closed for the entire first phase. Open it only after the final pour of the first phase is complete.
• Tip: The total brew time will be slightly longer than V60 4:6 due to the sealed steep phases. Expect 4:30–5:30 total.