Here's a quick and simple side dish that gets a flavor boost from the grill. Charring sweet potatoes on the grill gives them a smoky edge, and a piquant cilantro-lime dressing contrasts nicely with their natural sweetness.
In a small bowl, whisk the olive oil into the lime juice in a steady stream. Season with salt and pepper, to taste, and stir in the cilantro. Set aside.
Preheat a cast-iron grill pan or outdoor grill over medium heat. In a medium-sized bowl, toss the sweet potatoes with the oil and season with salt and pepper, to taste. When the grill is hot, add the sweet potatoes in a single layer and grill until marked on both sides and softened, about 5 minutes per side.
Serve with the dressing.