Roasted potato and vegetable salad - Potato Nation

Ingredients

• 5 potatoes, skin on and roughly chopped
• 45 ml olive oil
• Juice and zest of 1 lemon
• 2.50 ml salt
• 1.50 ml ground black pepper
• 250 g small parsnips
• 8 baby carrots
• 4 large leeks, halved
• 180 ml fresh cream
• 150 g blue cheese, crumbled
• 250 g watercress