Roasted fish with herby potatoes

Ingredients

• 1 tablespoon olive oil
• 400g potatoes, cubed
• 1 onion, chopped
• 1–2 garlic cloves, finely chopped
• 1 teaspoon dried oregano
• 4 tomatoes, cut into wedges
• 1 green or yellow pepper, sliced
• 2 skinless white fish fillets (eg cod, about 140g each – go for frozen if you’re watching the pennies)
• Freshly ground black pepper
• Fresh parsley, chopped
• ½ lemon, cut into wedges