Mildly Spiced Mushroom Biryani

Name: Mildly Spiced Mushroom Biryani
Ingredients: * 1 1/2 cup (375ml) basmati rice soaked in water for about an hour; * 3 cup (750ml) water; * 3 tablespoon warm milk; * a pinch of saffron; * 2 tablespoon vegetable oil; * 1 2 inch cinnamon stick; * 4 green cardamom pod; * 5 clove; * 2 bay leaf; * 6 black peppercorn; * 1 large onion finely chopped; * 2 tomato finely chopped; * 1 tablespoon garlic and ginger paste; * 2 green chillie finely chopped; * 200g thinly sliced button mushroom; * 1 tablespoon ground cumin; * 1 teaspoon garam masala (optional); * 1 small bunch fresh coriander finely chopped; * salt and pepper to taste