I disconnected the old sink, including the garburator. (I made sure the new sink would line up so I wouldn't have to change the drain pipes. It's 1 inch deeper but still fits as the countertop itself is a bit higher.)
Routering the drain board with a half-moon type router bit. I shimmed up the straightedge on one end to make a trench that gets deeper towards the sink, helping the water drain away from the countertop.