This satisfying riff on carne de porco à Alentejana, a popular dish of fried pork and clams, has many signature Portuguese ingredients: pork, shellfish, kale, garlic, bay leaves and dried chilies.
Heat oven to 300°F. Warm heavy ovenproof pot on stove over medium heat, and coat bottom with olive oil. Season pork belly on both sides with salt and pepper. Sear pork belly on both sides until dark brown. Transfer to plate, and drain excess fat from pan, leaving a thin coating. Add onion, carrot, celery and garlic, and cook until tender, about 5 minutes. Add tomato paste and paprika and cook another 2 minutes. Deglaze with ½ cup white wine.
Add pork belly, herbs and just enough stock to cover pork. Bring to boil. Cover pot, and place in oven. Cook for 2–3 hours, or until pork belly can be easily pierced with knife. Remove pork belly from pot, and keep warm in a 250°F oven.
Strain cooking liquid, discarding vegetables and herbs. Place broth back into pot, and cook over medium heat. Meanwhile, place mussels in large pot with remaining white wine. Cover, and cook over medium heat until the mussels have steamed open, about 15 minutes. Remove mussels and add pork-cooking liquid to pot. Reduce sauce by approximately three-quarters. Add salt, to taste.
In medium-sized pot or skillet, cook kale leaves in ½ cup olive oil until tender. Season to taste with salt and pepper.
Distribute kale among 4 plates. Slice pork belly into four even pieces, and place atop kale. Top each plate with steamed mussels and broccoli flowers. Spoon cooking broth over top, and serve with bread for sopping up broth. Serves 4.