For a smoother texture, use a food processor rather than a hand mixer.You can roast the carrots instead of boiling them for deeper, more caramelized flavor.The souffle can be assembled up to 24 hours ahead. Keep it covered in the refrigerator and add 5 to 10 extra minutes of baking time.Leftovers keep well in the fridge for up to 4 days. Reheat in the oven at 325°F for 15 minutes.For individual servings, divide the batter into greased ramekins and bake for 25 to 30 minutes.