How to Make It
In a large, deep skillet, heat the vegetable oil. Add the sliced onion and cook over moderate heat until translucent and softened, about 8 minutes. Add the minced garlic, paprika and cayenne pepper and cook, stirring, until fragrant, about 2 minutes. Add the green beans and 6 whole garlic cloves and cook for about 2 minutes, tossing to coat the beans.
Pour the diced tomatoes and their juices into the skillet and bring to a boil. Reduce the heat to low, cover the skillet and simmer, stirring occasionally, until the green beans are very tender, about 40 minutes. Season the braised green beans with salt and pepper. Transfer them to a platter and serve warm or at room temperature.