Heat oven to 200C/180C fan/gas 6. Toss the sweet potato with the oil and some seasoning. Spread on a baking parchment-lined baking tray and roast for 30-35 mins until tender. Cool to room temperature.

Whisk the dressing ingredients with a little more seasoning. Pile the potato onto a serving platter and drizzle over the dressing. Scatter over the feta and nuts, and very gently toss with your hands so you don’t break up the potato.