In a large saucepan, bring water to a boil; stir in rice and 1 teaspoon salt. Reduce heat; simmer, covered, until kernels have puffed open, 45-50 minutes. Drain any excess water., Preheat oven to 350°. In a 6-qt. stockpot, heat butter over medium-high heat; saute mushrooms and onion 5 minutes. Stir in rice, chicken, pimiento, parsley, pepper, broth, cream and remaining salt., Transfer to a 3-qt. or 13x9-in. baking dish. Sprinkle with cheese and almonds. Bake, uncovered, until heated through, 50-60 minutes.