Sesame Sweet Potato and Cabbage Burgers

This is a veggie burger I’ve always loved for its unexpected richness, thanks to the combination of sweet browned onions, sesame oil, and tahini. It’s worthwhile to cook the onions with some care, so as to allow them to caramelize and become sweet. And any variety of sweet potato will work—the purple ones lending the most distinctive color. Serve with one of the yogurt sauces, or simply drizzled with tahini and some crisp vegetables like cucumber slices, s