In a medium saucepan, combine oil, onion, poblano, 1 teaspoon cumin, black beans and 2 cups water. Season with salt and pepper. Cover and bring to a boil. Reduce heat to a simmer and cook soup 15 minutes or until flavors have blended.
While soup simmers, combine cilantro, jalapeno, sherry vinegar and remaining 1/2 teaspoon cumin in a blender with 3 tablespoons water. Season with salt and pepper. Blend until smooth; transfer to a bowl. Add ½ of soup to blender and blend until smooth; stir into remaining soup. Serve soup over rice, if desired, topped with cilantro sauce.
Before her diagnosis, Caroline wrote a book on cakes called Cake Magic!. She started developing a birthday cake using her gluten-free mix found in that book. Check out other recipes she’s developing for her new life—and the stories behind them—on her blog, The Wright Recipes. Her next book, Catalan Food, written with chef Daniel Olivella, comes out in early September from Clarkson Potter.