 Common in Western sweet and sour sauce is the addition of fruits such as pineapple and vegetables such as sweet pepper and green onions.Traditional rice vinegar is becoming more readily available due to the increase in Asian food stores but a mixture of vinegar and dry sherry is often still used in sweet and sour dishes.Also common is the use of corn starch as thickener for the sauce and tomato ketchup to give a stronger red colour to the dish and to add a Western taste.