Heat oven to 450 F (230 C).
Cut the cabbage in quarters lengthwise through the core, then cut out the cores and stem. Slice the quarters lengthwise into about 1½-inch-thick (3,5 cm) wedges.
Place the wedges on a rimmed sheet pan, lined with parchment paper, flat sides down. It’s OK if the pan seems a bit crowded; the wedges will shrink as they roast but try not to overlap much, if possible. Lightly drizzle them with oil.
In a small bowl, combine the soy and fish sauces, the garlic, the smoked pepper and the rosemary leaves. Add about ½ cup olive oil and stir to mix. Massage this mixture into each cabbage wedge, making sure it goes in-between the leaves.
Roast until cabbage is lightly browned in spots, about 20 minutes. Spritz with water, and continue roasting another 10 minutes, until the cabbage is tender and caramelized.
Sprinkle with the breadcrumbs and roast another 10 minutes, then remove from the oven, drizzle with a bit more olive oil, sprinkle with some black pepper and serve immediately or let cool and serve at room temperature.
