Split cabbage in half. Slice off flat slices about 1" thick. It helps if you leave the core in place to hold it together. Place cabbage slices on rimmed cookie sheet. (You could also slice in wedges.)
Mix ~2T lemon juice with ~ 2T olive oil. Brush over both sides of cabbage.
Salt and pepper to taste.
Place in 450 degree oven. Bake 15 minutes - turn over slices and bake additional 10-15 minutes.