Heat 2 teaspoons olive oil in a Dutch oven over medium heat. Add 1 diced onion and cook until soft, 5 minutes. Add 1 pound chopped collard greens, a handful at a time, adding more as it cooks down. Add 1 cup chicken broth and season with salt and pepper. Cover and simmer until tender, about 45 minutes.
Photograph by Antonis Achilleos