Most golfers are not comfortable taking a big swing when they are in deep grass around the green but it is the only way to get consistent results. Treat this shot just like a sand shot. From an open stance position the ball forward, open the clubface and make a bunker swing. You should hit slightly behind the ball and feel the bounce of the club hit the ground. Speed is the key ingredient, keep the clubhead moving through impact and splash the grass just like hitting a sand shot. It takes courage and commitment and of course a little (or lot) of practice.