How to make roasted sweet potatoes with horseradish butter. Picture: Andrew Scrivani (New York Times)
You can garnish this dish with herbs and fresh horseradish if you like.

Roasted Sweet Potatoes With Horseradish Butter
(Serves 8-10)

Ingredients

  • 8 tbs unsalted butter, at room temperature
  • ¼ cup finely grated fresh horseradish, plus coarsely grated horseradish for garnish, if desired
  • 3 tbs chopped fresh parsley, more for garnish
  • 3 tbs chopped fresh dill, more for garnish
  • 3 tbs breadcrumbs
  • Finely grated zest and juice of ½ lemon
  • ½ tsp kosher salt
  • ¼ tsp black pepper
  • 900g sweet potatoes

Method

  1. In a heavy-duty resealable plastic bag, combine butter, horseradish, parsley, dill, crumbs, lemon zest and juice, salt and pepper.
  2. Close the bag, pressing out most of the air.
  3. Mash everything together until well combined and smooth, then use a ruler or the back edge of a knife to scrape and work the butter to the bottom of the bag so it forms a log, rolling it as you go.
  4. Refrigerate for at least 2 hours to firm, or up to 1 week.
  5. Heat oven to 180°C.
  6. Prick sweet potatoes several times with a fork and wrap tightly in aluminium foil. Transfer to a baking sheet and roast until potatoes are tender, 45 minutes to 1½ hours, depending on the size of the potatoes.
  7. Once cool enough to handle, unwrap and slice into 1cm thick rounds (there is no need to peel unless you dislike the skins).
  8. Potatoes can be roasted up to 2 days ahead; wrap and chill, then slice them just before using.
  9. Arrange rounds on a large rimmed baking sheet and count how many you have. Slice enough thin slabs of butter from the log so that you have one per potato slice, and place butter on top of potato slices.
  10. Move the oven rack so that it’s 10cm away from the broiler. Bake potatoes at 180°C until they are heated through and the butter is softened, 5 to 15 minutes depending on how cold the potatoes were.
  11. Adjust oven temperature to broil, and broil until the butter is golden brown at the edges, 2 to 4 minutes.
  12. Serve garnished with herbs and fresh horseradish if you like. 

The New York Times