Thai green chicken curry

INGREDIENTS

• 225g new potatoes , cut into chunks
• 100g green beans , trimmed and halved
• 1 tbsp vegetable or sunflower oil
• 1 garlic clove , chopped
• 1 rounded tbsp or 4 tsp Thai green curry paste (you can't fit the tablespoon into some of the jars)
• 400ml can coconut milk
• 2 tsp Thai fish sauce
• 1 tsp caster sugar
• 450g boneless skinless chicken (breasts or thighs), cut into bite-size pieces
• 2 fresh kaffir lime leaves finely shredded, or 3 wide strips lime zest, plus extra to garnish
• good handful of basil leaves
• boiled rice , to serve