Preheat the oven to 500°.

For the compound lemon butter mix the butter with the basil, zest and lemon juice. Salt and pepper to taste. Make a log and wrap in plastic wrap and put in freezer or refrigerator to firm up. You are going to slice this and put some on each cauliflower steak.

Put some olive oil on a sheet pan or spray with cooking spray.

Cut the cauliflower into steaks going through the stem into about 1" slices. If the ends fall apart just put the pieces together on the sheet. Brush both sides of the cauliflower steaks with some of the olive oil. Season with salt and pepper and place on oven to roast.

About 12 minutes into roasting flip the steaks over if the pieces have turned a deep golden color on the bottoms. The steaks should be tender when pierced with a knife or fork. Bake for another 12 minutes. While the cauliflower is still warm from the oven, cut a slice of lemon butter to top each piece of "steak". Garnish with extra basil.