POST data using $resource

DEMO: http://jsfiddle.net/rob_balfre/7QUUf/

How do you POST data (across domain) using $resource?

For example this curl writes to the API with no problem:

curl --dump-header - -H "Content-Type: application/json" -X POST --data '{"name": "Wobbly"}' http://192.168.91.20/api/food/

and the header response is:

HTTP/1.0 201 CREATED
Date: Thu, 25 Oct 2012 08:19:42 GMT
Server: WSGIServer/0.1 Python/2.6.1
Access-Control-Allow-Headers: Content-Type,*
Location: http://localhost/api/food/15/
Access-Control-Allow-Credentials: true
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: POST,GET,OPTIONS,PUT,DELETE
Content-Type: text/html; charset=utf-8

I'm totally stuck on how to get angular to POST the same way. This is my $resource, it's worth noting that 'get' works just fine:

angular.module('tastypieModule', ['ngResource']).
factory('FoodOptions', function($resource, $timeout) {
   var FoodOptions = $resource('http://testurl/api/:type',
        {type: 'food'},
        {
            get: {method: 'JSONP', params: {format: 'jsonp', callback:'JSON_CALLBACK'}},
            update: {method: 'POST', headers: {'Content-Type': 'application/json'}}
        }
    );

 return FoodOptions;
})

When I call update it just fails and I see this is the console network tab:

METHOD: OPTIONS 
STATUS: (canceled) Load cancelled