Sweet Potato Pie

INGREDIENTS

• 1 cup chopped pecans, toasted
• Special equipment: steamer basket
• 1 tablespoon maple syrup
• 5 egg yolks
• Salt
• 1 (9-inch) deep dish, frozen pie shell
• 1/2 teaspoon of cinnamon
• 1/4 teaspoon of nutmeg
• 1 1/4 cups plain yogurt
• 1 pound 3 ounces sweet potatoes, peeled and cubed
• 3/4 cup packed, dark brown sugar