Preheat the oven to 225ºF.
In a large saucepan, combine the cauliflower, water and salt over high heat. Bring to a boil, then reduce heat to medium and cook until the cauliflower is very soft, about 30 minutes. Remove from the heat and drain. Put the cauliflower, 1 tablespoon olive oil, and the cream in a food processor and puree until smooth like creamed potatoes. Season with salt and white pepper.
Put the salmon in a shallow baking pan, rub it with the olive oil, and season with the kosher salt and black pepper. Bake for 15 minutes.
In a small skillet, heat the butter over medium heat and cook until it browns lightly, about 1 minute. Add the peas, stir gently, and cook for 1 minute. Spoon the pureed cauliflower in the center of each plate. Lay a piece of salmon on top of each and garnish with the peas.
Yield: 4 servings