Step 1

Preheat oven to 425 degrees F. Line a large baking sheet with parchment paper.

Step 2

Combine butter, miso, pepper and salt in a large bowl. Add sweet potato slices and toss to coat. Arrange them in a single layer on the baking sheet; scrape any remaining butter-miso mixture over them. Roast the sweet potatoes, flipping once, until lightly browned and tender, about 30 minutes.

Step 3

Whisk maple syrup and vinegar in a small bowl. Drizzle over the sweet potatoes. Serve sprinkled with rosemary.