De or het gehaktvulling?

The correct Dutch article is:

de gehaktvulling

Rule Words ending in -ing: almost always de. See the rule

How to use gehaktvulling

the gehaktvullingde gehaktvulling
this gehaktvullingdeze gehaktvulling
that gehaktvullingdie gehaktvulling
our gehaktvullingonze gehaktvulling
your gehaktvullingjouw gehaktvulling
every gehaktvullingelke gehaktvulling
which gehaktvulling?welke gehaktvulling?
a big gehaktvulling / the big gehaktvullingeen grote gehaktvulling, de grote gehaktvulling