Roasting this ultra-ranchy spice blend at a high heat for more than a few minutes can give some of the spices a bitter or, worse, burnt taste. So we dust the cauliflower with the blend at the end of the roasting time to keep its full burst of spicy flavor - a perfect complement to the earthy cauliflower.
Put the lemon zest on a paper towel-lined microwave-safe plate and microwave in 30-second increments, stirring in between, until the zest is dry and almost brittle, 2 to 4 minutes total. (The timing will largely depend on the power of your microwave.)
Remove the cauliflower from the oven and, while still warm, toss with 3 tablespoons of the spice blend. (Reserve the remaining spice blend for another use. See Cook's Note below.) Transfer to a platter and serve.
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