Lalla Rookh Pie | Saveur

Ingredients

• 6 Tbsp. (3 oz.) unsalted butter, plus more for greasing
• 6 oz. English-style digestive biscuits (such as McVitie’s), or substitute graham crackers (about twelve 3-inch biscuits)
• ½ cup (2 oz.) <a href="%E2%80%9Dhttps://www.saveur.com/how-to-toast-any-kind-of-nut/%E2%80%9D/">toasted walnut halves</a>, plus 8 additional walnut halves for garnish
• ¼ cup (2 oz.) sugar
• Pinch of kosher salt
• 1½ qt. store bought vanilla ice cream
• ½ cup dark rum or Cognac
• 1 cup heavy cream
• 2 Tbsp. confectioners’ sugar
• 1½ tsp. instant espresso powder dissolved in 2 tsp. heavy cream
• ¾ tsp. vanilla extract
• Bittersweet chocolate shavings, for garnish