Trader Joe's General Tso Chicken Sauce

I'm a huge fan of General Tso Chicken. I've found that most places in Springfield don't make it to my tastes though. It's either way too sweet, not sweet at all, and/or usually not spicy at all. While we were in St. Louis last month we made the obligatory visit to Trader Joe's (which I'd love to see in Springfield, MO) and one of our purchases was a bottle of General Tso sauce for use in stir fry.

The stir fry was fairly simple (we didin't deep fry the chicken as is traditional). It consisted of chicken, red and green pepper, carrot, sweet onion, and then steamed broccoli at the end. All in all quite good. The sauce wasn't quite spicy enough so I added some hot pepper flakes while cooking the chicken and it came out quite well. I did have to add a cornstarch slurry to thicken the sauce up a bit.

I've decided that one of my new cooking goals is going to be making oriental food. Got any cookbook suggestions?