So, I settled for something simple. The recipe I loosely followed can be found here: Italian Sausage and Onions Recipe
I modified it by drizzling the onions and the sausage with olive oil, balsamic vinegar, freshly ground pepper, in addition to the rosemary and the kosher salt. The whole meal took me about 30 minutes. While the sausage was in the oven, I just cooked up some yu choy with dried shrimp and heated up some leftover rice. And of course, I made extra so that I would have lunch for tomorrow. I love days at work when I am excited to eat my lunch.
I liked it. Simple and easy and it hit the spot.