In a large skillet over medium heat, sauté the onion, garlic and leek for about 5 minutes, until the onion and leek are translucent.
Add the tomatoes and stir to combine all the ingredients. Sauté the tomatoes for 5 minutes and then add the kale and generously squeeze lemon juice over the ingredients.
Cook for another 5-10 minutes until the kale is wilted and reduces in size.
Add a splash of white wine, about 1/4 cup, and bring to a boil. Reduce the wine by half and then add the coconut milk and a splash of heavy cream.
Reduce the heat, season with salt and pepper, and simmer for about 5-8 minutes. The sauce will thicken very slightly.
Taste and add more lemon juice if it needs a bigger acidity kick.
To serve, spoon couscous on the plates, top with the wilted kale and tomatoes and then the salmon. Add another squeeze of lemon juice and a sprinkle of Maldon salt and parsley.