Step 1

Preheat oven to 450°. Toss sweet potatoes and oil on a foil-lined large rimmed baking sheet; season with salt and pepper.

Step 2

Roast, turning once, until golden brown and crisp, 25–30 minutes.

Step 3

Meanwhile, whisk mayonnaise, lime zest, and juice in a small bowl.

Step 4

Season fries with salt, top with cilantro, and serve with lime mayo for dipping.