For serving: grated Parmesan (highly recommended)chopped fresh herbs, such as thyme or parsley (optional)
Preheat oven to 400 degrees F. Generously coat a rimmed baking sheet with nonstick spray and set aside.
Cut off the bottom (root) end of the cabbage and place it on a cutting board sitting up so that the flat end is on the cutting board. Cut top to bottom into 3/4- to 1-inch thick slices. Place on the prepared baking sheet. If you have more slices than fit on your baking sheet without touching, divide them between two baking sheets.
In a small bowl, whisk together the olive oil, garlic, salt, and pepper. Brush over one side of the cabbage, then flip the cabbage over and brush the other side. Roast the cabbage for 26 to 28 minutes, or until crispy at the edges and tender in the center. (If you are using one pan, roast it on the center rack; if two, use the the upper and lower-third racks.) Halfway through the baking time, rotate the pan(s) 180 degrees; if you are using two pans, switch their positions on the upper and lower racks at this point too. No need to flip the cabbage over. Don’t worry about any extra crispy, dark leaves around the very outsides; they’ll taste incredible.
While the cabbage bakes, toast the pecans in the oven at the same time: spread the pecans onto a small, ungreased baking sheet. Toast them in the oven with the cabbage until fragrant and the center of a pecan is light tan when broken in half, about 8 minutes, tossing them once halfway through. DO NOT WALK AWAY during the last several minutes of baking. Nuts love to burn the second you do. Remove the pecans from the oven and transfer immediately to a cutting board (if you leave them on the hot pan and they are super toasted already, they may burn). Let cool, then roughly chop.
Sprinkle the roasted cabbage with Parmesan and fresh herbs. Squeeze the lemon over the top, then finish with the chopped pecans. Serve hot.
TO STORE: Place leftover cabbage steaks in an airtight storage container in the refrigerator for up to 1 week.
TO REHEAT: Reheat steaks in the oven at 350 degrees F for about 4 minutes on a piece of aluminum foil that's lightly coated with nonstick spray.
TO FREEZE: Cabbage steaks can be frozen in an airtight freezer-safe storage container for up to 3 months. The texture of the cabbage may change a little, but they will still be tasty!
TO COOK THE CABBAGE STEAKS ON THE GRILL: See above blog post for cooking tips.