keg beer... put in refrigeration... apply 30psi for 24 hours then drop down to 10psi. You will have to wait a few days for it to be carbonated just right but the 1 day at 30psi speeds it up a lot without overcarbing. That is what I do anyway. Leaving it high psi for more than 1 day has overcarbonated beer for me.
Fat Messiah Brewing