4. When your watch reads 30 seconds, you can add another 135g of water from the kettle. Be gentle with the pouring, aiming for the centre of the coffee.
5. When your watch reads 60 seconds, add 135g of water and finish with another gentle, circular stir, for 3 seconds.
6. Your coffee should take 3 to 4 minutes to drip through. If it is too fast, grind finer. If it is too slow, grind coarser.