Hi - we used speech therapist who used the SOS method Sequential Oral Sensory (SOS) approach. I actually think we were perhaps one of her first feeding clients - but wow she is good. It just goes to show, you need the therapist that is right for your child.
Feeding aversion is rarely caused by just one issue - we had a bunch of issues to work through (stealth reflux, general ot sensory stuff, ...) We are still figuring out some physical issues - does he have ee or just sensitive tummy or is it ee triggered by environmental allergens and not food as he does not fit the standard profile per allergist and gi......
still doing therapy but now it is more about adding complex dishes into the mix. I started this thread years ago - it shows what we did and also good ideas others had over the years.
http://www.dcurbanmom.com/jforum/posts/list/98518.page the best advice i have is accept that it is a very complex puzzle and just work the layers of the puzzle. Addressing general sensory issues will help, having a very good family dinner routine will help, working on behavior and/or anxiety issues will help, having the child help buy food, cook food, grow food, will help. But progress is measured in milimeters and patience is required.
Heck - i never ate certain foods as a child, but eat them now as an adult because I saw my parents eat and enjoy them while i was growing up. So, addressing feeding issues is a long term play - and progress will come in fits and starts.