Hainanese chicken chop

Ingredients

• 4 boneless chicken leg quarters
• 3 tablespoons rice flour
• Vegetable oil, for deep-frying
• 3 russet potatoes, boiled until tender, cut into thick wedges
• Marinade
• 1 tablespoon oyster sauce
• 1 tablespoon light soy sauce
• 1 tablespoon sugar
• 1 teaspoon dark soy sauce
• 1½ teaspoons salt, or to taste
• 1 teaspoon freshly ground black pepper
• Tangy tomato sauce
• 80 ml (⅓ cup) vegetable oil
• 1½ onions, sliced
• 160 g (5½ oz) tomato ketchup
• 1 tablespoon worcestershire sauce
• 2 tablespoons sugar
• 1 teaspoon salt, or to taste
• 2 teaspoons light soy sauce
• 1 tablespoon cornflour (cornstarch), blended with 100 ml (3½ fl oz) water
• 2 tomatoes, cut into wedges
• 80 g (½ cup) frozen peas