South Asian chicken curry

Name: South Asian chicken curry
Ingredients: 1 small onion; 2 cloves garlic; 1 6cm piece ginger; a few sprigs fresh coriander; 2 peppers , mixed-colour; 100g cherry tomatoes; 2 skinless, boneless chicken thighs , higher-welfare; vegetable oil; 2 heaped teaspoons curry poweder; half teaspoon turmeric; 100ml light coconut milk; 100ml organic chicken stock; 160g basmati rice; 1 lime; 1 tablespoon mango chutney , (optional)