Add 1/2 potatoes to the cauliflower. With a stick blender, process the cauliflower, potatoes, stock, and onion until smooth. Mix 2 tablespoons cornstarch to 1/4 cup of water or cool stock and blend. Add to processed cauliflower mixture. Bring to boil and then reduce to simmer. Add in all the vegetables, bacon, remaining potato, clams, and scallop. (Use any liquid in the clams). Season with sea salt and freshly ground pepper to taste. Simmer 5 minutes on low, and serve.