Preheat oven to 425 F.
Place cabbage slices on a baking sheet with a Silpat mat or sprayed with non-stick spray.
Brush cabbage with oil and season with salt and pepper.
Place in oven and roast 20 minutes or until slightly softened and lightly charred.
Meanwhile, prepare the sauce by melting the butter in a small saucepan.
Whisk in the remaining ingredients and season with salt and pepper.
Remove roasted cabbage slices from the oven and serve drizzled with the sauce.