4 cups chicken stock
3 large russet potatoes, peeled and cut into 1/2-inch cubes (about 4 cups)
1 tablespoon Dijon mustard
8 ounces sliced smoked bacon
2 carrots, 1/2-inch dice (about 1 cup)
Kosher salt and freshly ground pepper
3 stalks celery, 1/2-inch dice (about 1 cup)
2 bay leaves
1 small bundle fresh thyme, tied together with kitchen twine
1 leek, green top trimmed, 1/2-inch dice (about 1 cup)
1 cup light German beer, such as Pilsner
1/4 cup sliced fresh chives