Garnet Yams with BLiS Maple Syrup and Maple Sugar Streusel

Ingredients

• 3 1/2 pounds slender garnet yams or other yams (red-skinned sweet potatoes; about 2 1/2 inches in diameter)
• 1/4 cup BLiS Bourbon Maple Syrup or other pure maple syrup
• 1/4 cup (1/2 stick) unsalted butter
• 1 tablespoon apple cider vinegar
• 1 teaspoon coarse kosher salt
• 3/4 teaspoon freshly ground black pepper
• 1 cup all purpose flour
• 1/2 cup maple sugar* (scant 3 ounces)
• 1/3 cup (packed) golden brown sugar
• 3/4 teaspoon ground cinnamon
• 6 tablespoons (3/4 stick) unsalted butter, melted