• 4 medium orange-fleshed sweet potatoes, scrubbed and unpeeled

• 8 good-quality beef, lamb or pork sausages (check gluten-free if required)

• 2 large red onions, peeled, cut into quarters

• 2 tbsp olive oil

• ½ cup sour cream, to serve

Rough salsa verde

• ½ cup each shredded flat-leaf parsley leaves, basil leaves and mint leaves

• 1 garlic clove, minced

• 4 cornichons, finely chopped

• 1 tsp capers, roughly chopped

• 1 anchovy fillet, minced (or 1 tsp fish sauce)

• 1 lemon, juiced

• ¼ cup extra virgin olive oil