Dirty Rotten Roman Risotto

Name: Dirty Rotten Roman Risotto
Ingredients: 1/4 pound chicken gizzards; 1/4 pound chicken hearts; 1/4 pound chicken livers (to be cooked separately); 1/4 cup guanciale or pancetta, chopped; 1 rib celery plus leaves , chopped (set the leaves aside); 1/2 cup tomato puree (if I were in Roma I would use passata, which is looser than American puree but you can thin it with a little wine if you like); 1 teaspoon fresh thyme; 1/2 cup chopped red onion or shallot; 1 clove garlic, minced; 1/4 cup white wine; 1 1/2 cups Arborio or carnaroli rice; 5 cups good chicken stock; extra virgin olive oil; about 2 ounces butte; salt and pepper