Meat Doria (Rice Gratin)

Bahan-bahan (4 porsi)

• 4 servings cooked Japanese short-grain rice ((hot; about 4 cups, 600 g))
• ½ onion
• 1 rib celery
• 1 carrot
• 6 mushrooms
• 12 oz ground beef and pork combination ((preferably 70% beef and 30% pork))
• 1 can diced tomatoes ((14.5 oz, 411 g))
• 3 –4 cups vegetable stock/broth
• 2 Tbsp extra virgin olive oil
• 1 bay leaf
• 4 Tbsp red wine
• ½ tsp sugar
• 3 Tbsp ketchup
• 3 Tbsp tonkatsu sauce ((or Worcestershire sauce))
• 1 Tbsp unsalted butter ((plus more to grease the baking dish))
• Diamond Crystal kosher salt
• freshly ground black pepper
• ¾ –1 cup Mozzarella cheese ((grated))
• ¾ –1 cup Parmigiano-Reggiano or Parmesan cheese ((grated))
• 2 –3 Tbsp panko (Japanese breadcrumbs)
• parsley ((fresh, to garnish))