We love Panda Express Mandarin sauce! It has a nice depth of soy flavor with a hint of ginger and sesame, and it's very sweet. It goes well with everything we've tried so far. It doesn't contain high fructose corn syrup, unlike most similar sauces on the market.
I add a tiny bit to broccoli and my granddaughter gobbles it up! In fact, she even asks for 'the good broccoli' for her after school snack now. We always have a bottle in the fridge.