Step 1

Preheat oven to 450°F.

Step 2

In a large bowl, combine the oil, five-spice powder, and salt. Add sweet potatoes and mix well to coat evenly.

Step 3

Place spears in a single layer on a baking sheet and bake in pre-heated oven until soft (15 to 20 minutes).

Step 4

In a small bowl, mix mayonnaise, lemon juice, garlic, and ginger. Serve aioli as a dipping sauce for the sweet potato fries.