Saffron Rice Pudding

Name: Saffron Rice Pudding
Ingredients: 1/4 teaspoon saffron threads; 2 1/2 cups whole milk, plus more for serving; 1 1/2 cups cooked rice, preferably basmati; 3 tablespoons uncooked sweet rice (mochigome); 1/8 teaspoon ground cardamom; 1/2 cup heavy cream; 1/3 cup granulated sugar; 2 tablespoons pomegranate arils; 2 tablespoons chopped pistachios