I've been using a Clever Dripper for quite a while - it's my daily driver for coffee at home. I didn't even know that Hario had come out with an immersion mod for the V60.
Here's my baseline - you'll want to tweak to your taste:
- Use a coarse grind. Find the coarsest setting your grinder will support while still giving you consistency.
- Coffee/water ratio of about 1:15. I generally use 500mL water to 32-33g coffee (max capacity for my Clever Dripper, I like a big cup)
- Water temp: 200-205°F for light/med roast. I'd go lower for darker roasts, maybe 190-195°F, or it will end up too bitter.
- Immersion time: 2.5 minutes
Also a few notes on technique:
- Boil extra water for rinsing your filter and pre-heating your cup.
- When your water is ready, rinse the filter and dump it out first. This helps increase yield and gets rid of any off flavor your filters might have.
- I use a scale to weigh my water and coffee as it goes into the brewer. You can eyeball if you want, but the scale helps me with consistency.
- Don't put the coffee in first. Add about 100mL of water, then coffee, then the rest of the water. This helps keep my filters from getting clogged by fines and speeds up the drain time a lot (like 30-45 seconds faster).
- After adding the coffee, pour the remaining water in a circular motion to try to wet down and "sink" all the coffee grounds. A gooseneck kettle helps with this. If your coffee is really fresh and starts blooming (off-gassing CO2), be careful that you don't overflow the brewer.
- Pour the rest of the water from your kettle into your cup to pre-heat it. This helps keep your coffee hot longer.
- About a minute into the brew time, I will give everything a quick stir. This gets the grounds off the sides of the filter and helps them start settling into the bed of grounds that you want to drain through.
- At the end of immersion time, dump your pre-heat water and drain into your cup. Enjoy!
You can (and should!) experiment with grind size, water temperature, immersion time, and ratios to tune the taste to your liking.