Yes, the bloom is the foam that forms in the coffee grounds. It’s CO2 and releasing it allows for better extraction. Puncture means to take a knife and cut a f

Yes, the bloom is the foam that forms in the coffee grounds. It’s CO2 and releasing it allows for better extraction. Puncture means to take a knife and cut a few pie slices into the mass of grounds and release the gas beneath. The grounds will sink at that point. I try not to stir aggressively since that is counterproductive to producing a “clear” cup. Once a few minutes have passed, you can plunge accordingly.