Preheat the oven to 425.
Add the cabbage to a large sheet pan, drizzle with the olive oil and season with the salt and pepper. Place it in the oven for 25-30 minutes, tossing it a couple times. It should be browned and tender. When it finishes, add the arugula to the cabbage and toss.
While the cabbage roasts, make the dressing. Heat a skillet with a little olive oil over medium high, add the half of lemon face down for two minutes. It softens the flavor and releases the juices.
Add the olive oil, tahini, dill, water, capers, honey, salt, pepper and then squeeze the lemon juice into the dressing. Blend with an immersion blender until smooth.
Make the topping. Add the panko, Parmesan and chives to a bowl and toss.
Plate the cabbage, top with the topping and then dress and toss again.
