Preheat oven to 450°F. Spray or rub oil onto a baking sheet.
Cut a head of cabbage in quarters, removing any outer discolored leaves. Place on the baking sheet, cut sides up.
Drizzle about 1/2 tablespoon oil over each quarter and spread with a brush or fingers to cover all sides. Alternatively, use spray oil generously to cover all sides.
Sprinkle liberally with salt and pepper.
Place one flat (cut) side down and roast for 15 minutes, then turn over so other cut side is down and cook another 10 minutes.
Remove from oven and squeeze some lemon juice over the cabbage wedges. Serve immediately.