Place cauliflower and water in 1 1/2-qt. glass casserole. Cover w/ lid.
Microwave 9 min on high. Drain. Combine mayonnaise, onion, mustard and salt in small mixing bowl. Spoon mustard sauce on top of cauliflower. Sprinkle w/ cheese.
Microwave 1 1/2 to 3 minutes on Med-High to heat topping and melt cheese. Let stand 2 minutes before serving.
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