In shallow pan toast sesame seed 10 minutes or until browned, shaking pan occasionally.
Rinse cauliflower and separate into small florets. Cook in a 2 quart covered saucepan, in 1 inch boiling salted water, 8 to 10 minutes or until tender; drain well.
Place half of cauliflower in a buttered 1 quart casserole; season with salt and pepper, spread with 1/2 sour cream and sprinkle over 1/2 cup cheese. Top with 1 tsp sesame seed. Repeat with remaining ingredients.
Bake at 375° F - (190°C) for 15 minutes or until heated through.
Servings: 6