Thai green chicken curry

Name: 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 lime leaves finely shredded, or 3 wide strips lime zest, plus extra to garnish; good handful of basil leaves; boiled rice to serve