A couple of years ago I had purchased a Raspberry Chipotle BBQ Sauce and just loved it. I had some frozen meatballs on hand and wanted to make a quick dinner and was thinking about using a sweet & sour sauce with them and remembered how very good that BBQ sauce was. I started with the tomato base/sweetener/vinegar/liquid combination of your typical sweet & sour sauce and came up with this recipe. I doubled this so we would have extra sauce. When finished I put the meatballs straight into the frying pan with the sauce and simmered them until heated through, served with rice.....a very quick dinner!