Sweet Potato Streusel Pie

Ingredients

• 1 ¼ cups all purpose flour
• ½ teaspoon fine sea salt
• ½ cup (1 stick) cold unsalted butter, cubed and chilled again
• ¼ cup ice water
• 1 ½ pounds (2 very large or 2 medium) yams, aka what you know as sweet potatoes (or 2 ¼ cups pre-cooked mashed yams)
• ¾ cup sugar
• ½ cup sweetened condensed milk
• ¼ cup light brown sugar
• 2 eggs
• 1 tablespoon vanilla extract
• ½ teaspoon ground cinnamon
• ¼ teaspoon fine salt
• Dash nutmeg
• 1 cup pecans
• ¼ cup firmly packed dark brown sugar
• 3 tablespoons cubed unsalted butter, chilled
• 3 tablespoons flour
• ⅛ teaspoon fine sea salt
• 2 cups heavy cream
• 1 or 2 vanilla beans, scraped (or 2 teaspoons vanilla extract)
• 3 tablespoons white sugar or confectioners sugar