Combine the onion and 1/4 cup of water. Bring to boiling. Cover and simmer for 5 minutes. Drain. Combine the skim milk, cornstarch, bouillon granules, 1/4 teaspoon of salt, and a dash of pepper. Add to onion. Cook and stir until thickened and bubbly. Add 1/4 cup of cheese, stir to melt. Remove from heat. Halve any large pieces of cauliflower. Stir in cauliflower, chicken and pimento. Spoon the mixture into 2 individual baking dishes. Bake in a 325ºF. oven for 15 minutes. Sprinkle the remaining cheese atop of each. Bake for 5 minutes more. Serve immediately. Serves 2