Lemon sole goujons with mushy peas and sweet potato chips

INGREDIENTS

• 2 sweet potatoes
• 2 tbsp olive oil
• 50g/1¾oz plain flour
• 2 free-range eggs
• 100g/3½oz fresh breadcrumbs
• ½ tsp cayenne pepper
• ½ lemon
• 4 fillets lemon sole
• salt and freshly ground black pepper
• 4 tbsp olive oil
• 200g/7¼oz peas
• 1 tbsp crème fraîche
• ½ tsp ready-made mint sauce
• squeeze lemon juice
• 3 tbsp ready-made mayonnaise