Mushroom and Peanut Biryani

Ingredients

• 2 cups aged basmati rice
• 10 cups water
• 6 black peppercorns
• 4 whole cloves
• 4 green cardamom pods
• 2 bay leaves
• 1-inch piece cinnamon stick
• 1/4 cup light vegetable oil, such as peanut oil or canola oil
• 6 green cardamom pods
• 3 whole cloves
• 1 tablespoon mustard seeds
• 1 teaspoon cumin seeds
• 36 curry leaves, roughly torn
• 2 to 6 dried red chiles
• 1 cup of roasted peanuts
• 1 teaspoon turmeric powder
• 1 teaspoon ground coriander
• 2 pounds white button mushrooms, cleaned, trimmed and thickly sliced
• 1 tablespoon sea salt
• 1 teaspoon sambhar powder
• 1 cup buttermilk
• 1/4 teaspoon freshly cracked peppercorns
• 1 tablespoon unsalted butter at room temperature
• 3/4 cup chopped coriander leaves and tender green stems
• 1/2 cup water