Get a proper guiness glass. There would've a harp indent in a circle on it. If it does not have it,it is monkey shines.
This can be performed with a keg tap or a can. It can not be performed by bottle. If you buy a bottle, you are a faggot.
Some may ask "why am I a faggot?"
Two words. Nitro faggot.
Nitro is not carbonation. Nitro is a storage method that not only provides better storage, it is heavier than air resulting in removing aging processes in alcohol storage.
This is commonly done expensive wine after opening. It doesn't work with carbonated beers because the nitro is heavier than carbonation , making it flat.
The modus operandi is settling.
So. Here's how its done, this is official from the guiness HQ. Pout the beer to the middle of the harp on the glass. Or about 2/3rds the way up.
You are to wait 123 seconds, but this varies on the temp of the beer, shot for 44 degrees but remember this shit gets real technical.
Once the time has passed you add the rest of the pour directly in the center of the glass.
If you miss the center of the glass, you risk frogs eyes. Frogs eyes are bubbles in the foam. If you pour this right the flavor the beer should like like a frozen drop in the water.
Its commonly called layering.