Sweet Sour Chicken

Super duper easy! But I'm confused why it is called 'sweet sour' as no sour ingredient in it..

• Brown Onion - diced and sauteed.
• Boneless breast chicken - diced, add into onion. Keep stiring untill cooked.
• Pour sweet chilli & oyster sauce. Salt if necessary.
• Add in diced cucumber.
• Serve