Beef Broth with Liver Dumplings and Saffron

Name: Beef Broth with Liver Dumplings and Saffron
Ingredients: 2 lb. beef bones, cut into 2-inch pieces; 2 stalks celery, finely diced; 2 medium carrots, finely diced; 1 medium celery root, peeled and finely diced; 1 medium turnip, peeled and finely diced; 1 medium white onion, finely diced; 1 tbsp. kosher salt, plus more; 2 tsp. whole black peppercorns; 2 cloves garlic, thinly sliced lengthwise; 1 bunch flat-leaf parsley, plus whole leaves to garnish; 1 bay leaf; 1 vine-ripe tomato, cored and roughly chopped; 1⁄8 tsp. crushed saffron threads; Freshly ground black pepper