Spicy pork meatball pittas with harissa mayo and sweet potatoes

Method

1. Preheat the oven to 200°C/fan180°C/ gas 6. Cook the sweet potato in a large pan of salted boiling water for 4 minutes, then drain well. Toss in 2 tbsp of the oil, put in a baking tray, season and roast for 20 minutes, turning now and then, until golden.
2. In a big pan, fry the onion in 1 tbsp oil for 3-4 minutes. Add the ginger, lemongrass, garlic and 2 tsp harissa. Fry for 2-3 minutes; season, cool and put in a bowl. Add the sausagemeat, coriander, breadcrumbs and egg yolk. Season, shape into 16 small balls and chill for 10 minutes. Drizzle in a little oil, then bake in a roasting tray for 15-20 minutes until golden brown and cooked through. (Shake the tin occasionally to cook evenly.) Remove, set aside and keep warm.
3. Mix the mayonnaise with the rest of the harissa and the lemon juice.
4. Split the pittas in half, put a handful of rocket and a few meatballs in each, then a dollop of harissa mayo. Serve with the sweet potato wedges.