In a large mixing bowl, cream the butter and sugar.Then stir in lemon juice and eggs and the additional yoke and grated lemon peel.Then pour into mason jars, and add the lids.Then in your Instant Pot, add two cups, and then place your trivet inside, then place the closed jars onto the trivet.Add your lid, make sure the vent is on closed and set time for 9 minutes on manual high temperature.Let it naturally release when done.Then let them come to room temperature and then refrigerate.