The meat on a bacon hock takes longer to become tender, so cook on stove-top for an hour before placing in the slow-cooker. You could cook the soup for longer in the slow-cooker, but I love the ...

Add the garlic and soup celery if using and cook for 5 minutes. Mix into the lentils with the ham hock. Whisk the mustard, honey and vinegar together. Whisk in the oil and check seasoning.