Preheat the oven to 220C, fan-forced. Line 2 oven trays with baking paper. Cut the unpeeled sweet potatoes into 1cm-thick rounds. Put the sweet potato on a lined tray, drizzle with 2 tsp vegetable oil, season with salt and pepper and toss to coat. Roast on the lower oven shelf for 25 mins or until golden and tender.
Step 2 — Prep ingredients
Meanwhile, thinly slice the cabbage with a sharp knife or mandoline. Thinly slice the spring onion. Pick half the mint leaves, then finely chop the remaining leaves, discarding the stems. Drizzle the lamb with 2 tsp vegetable oil and season with salt and pepper.
Step 3 — Roast lamb
Heat a medium frypan over high heat until hot. Cook the lamb, turning regularly, for 4 mins or until browned. Transfer to the remaining lined tray. Roast the lamb on the upper shelf for 7 mins. Scatter over ¾ tsp curry powder, then roast for a further 3-5 mins for medium-rare, or until cooked to your liking. Remove the lamb from the oven and rest for 8 mins (see Kitchen 101).
Step 4 — Make slaw
While the lamb is roasting, put the mango chutney, chopped mint, 1½ tsp curry powder*, 2 tbs mayonnaise, 1 tsp white wine vinegar and 1 tsp water in a large bowl and stir to combine. Add the cabbage and spring onion and toss to coat. Taste, then season with salt and pepper.
Step 5 — Serve up
Slice the lamb. Divide the lamb, sweet potato and slaw among plates. Scatter with the mint leaves and enjoy!
Step 6 — Kitchen 101
It's important to rest meat before you slice it. Resting allows the moisture to re-absorb into the meat, ensuring it is tender and juicy.