Beef stew with sweet potatoes and green beans

I made this for my parents when they were in town. My dad is a notoriously picky eater, and even he loved this.

It's essentially the same recipe as Beef Stew with Butternut Squash, only with sweet potatoes. I roasted, peeled and chopped the sweet potatoes before adding them. Also, I left out the onions (my mom is allergic) and threw in an entire head of garlic instead. At the last minute, I added two or three big handfuls of frozen green beans.