You would need to get some food coloring into the beer.
The easiest way is to use a straw or a toothpick to pick up a small drop of green food coloring and mix it into the beer after you pour it.
That being said you "could" theoretically get the food coloring in the keg. One way this might be done would be to make sure your keg is cold pull it out of the fridge and set it on the floor in front of the kegerator. with the keg tapped and THE GAS TURNED OFF. Depressurize the keg till you hear no gas coming out. Confirm this by making sure no beer comes out of the faucet. Then immediately unscrew the hex nut on the gas side of the coupler, again make sure you depressurize again right before you attempt to take this off and make sure the gas tank is OFF/DISCONNECTED. If not you will have gas flying everywhere. Also make sure that you DO NOT agitate the keg during this procedure because it will cause the co2 to exit the liquid and potentially put some pressure in the keg. OK, now we have access to the beer in the keg through the gas inlet on the coupler. There is probably a rubber gas check valve in there you should remove that as well. Using a small funnel in the gas opening you can add some food coloring. I am not sure how much you would want to use so start with 1/4 to 1/2 a small bottle and work up. After the green food coloring is in the beer you can probably untap the keg. Clean up, reassemble the gas line and agitate the keg. AGAIN MAKE SURE IT IS NOT HOOKED UP TO THIS PARTIALLY ASSEMBLED COUPLER. It could get rough if it were. Shake the untapped keg to mix the food coloring. Hook everything back up and tap the keg. Before turning on the gas depressurize again. Then turn on the gas which should repressurize the keg to your original setting and you should be pouring green beer.
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