Preheat the oven to 190C/Gas5; prick each sweet potato with a fork and wrap in kitchen paper; microwave them all together for 10-12 minutes on high (900W) until slightly softened; cut each one into 6-8 wedges and spread out in a single layer in a large roasting tray, together with the red onion wedges
Combine the olive oil, mustard, maple syrup, smoked paprika, fennel seeds, garlic, zest of ½ lemon, thyme and seasoning; drizzle half over the vegetables and mix gently; put the pork chops on top of the vegetables and drizzle with the rest of the oil mixture
Roast in the oven for 35 minutes until the vegetables are tender and the pork chops cooked through
Squeeze the lemon juice all over and scatter over the herbs just before serving with lemon wedges
4 servings