web mapping - Django PolygonField: how to display on map?

Extremely beginner question.

I have a GeoDjango model with a MultiPolygonField. How do I retrieve the value of this field and display it as a polygon on a map?

class county(models.Model):

    cd = models.CharField(max_length=10)
    geom = models.MultiPolygonField(srid=27700)
    objects = models.GeoManager()

def lsoa(request, code):
    county = get_object_or_404(county.objects, cd=code)
    return render_to_response('county.html', { 'county': county }, context_instance = RequestContext(request))

I know GeoJson is involved somewhere along the line, but I'm struggling with to get it out of Django, and with how to display it.