Morel Mushroom and Wild Rice Risotto
1 cup brown rice 1 cup wild rice 1 onion, diced 1 tablespoon grated Pecorino Romano cheese, o… 1 teaspoon dried thyme 2 carrots, diced 2 cloves garlic, minced 2 stalks celery, diced 2 tablespoons olive oil 2 tablespoons unsalted butter, divided 3 cups water, or as needed 6 cups chicken broth, or as needed salt and ground black pepper to taste ¼ cup heavy cream ½ cup dry white wine ½ pound fresh morel mushrooms, chopped, divid…