Core 1 whole head cauliflower from bottom for more even cooking. Run under water and place in round glass dish. Loosely cover with plastic wrap and microwave for 9 minutes on high power.

Make sauce: 2 tbsp. prepared mustard 1 tbsp. finely diced onion, more or less Dash of cayenne pepper

Mix together. Spread sauce over cooked cauliflower. Grate 1/2 cup (more or less) and put cheese into sauce on cauliflower. Cover lightly with plastic wrap and cook 1 minute and 45 seconds on medium power to melt cheese. Garnish with parsley around base (optional).