Preparation Whisk milk and eggs in a large bowl to blend. Whisk flour, cornstarch, baking powder, sugar, and salt in a medium bowl. Add dry ingredients to egg mixture; whisk just to blend. Cover and chill for up to 1 hour. Melt duck fat in a large skillet to a depth of 1/3" over medium heat. Using a 1/4-cup measure and working in batches, spoon batter into skillet. Cook until pancakes are slightly puffed and golden brown and bubbles form and begin to pop along edges, 1-2 minutes. Flip and cook until golden brown and cooked through, 1-2 minutes longer. Using a slotted spoon, transfer pancakes to a paper towel-lined plate. Transfer pancakes to plates. Drizzle generously with syrup.
Preparation Whisk milk and eggs in a large bowl to blend. Whisk flour, cornstarch, baking powder, sugar, and salt in a medium bowl. Add dry ingredients to egg mixture; whisk just to blend. Cover and chill for up to 1 hour. Melt duck fat in a large skillet to a depth of 1/3" over medium heat. Using a 1/4-cup measure and working in batches, spoon batter into skillet. Cook until pancakes are slightly puffed and golden brown and bubbles form and begin to pop along edges, 1-2 minutes. Flip and cook until golden brown and cooked through, 1-2 minutes longer. Using a slotted spoon, transfer pancakes to a paper towel-lined plate. Transfer pancakes to plates. Drizzle generously with syrup.