Preheat the oven to 400F.
Cut the cabbage in half, keeping the stem intact, then cut each piece into thirds so you end up with 6 thick wedges. You’ll get some random pieces falling off but that’s ok. You can transfer those bits straight to the rimmed baking sheet.
Place the cumin and coriander in a dry pan over medium heat and toast them 1 minute until their aromas are released. Grind the spices in a mortar and pestel and then mix in the alspice, olive oil, and 1/2 teaspoon salt. Spread this spice mixture all over the cabbage, using your fingers to massage it into each piece.
Heat a griddle pan until it is very hot. Sear the cabbage wedges for about 4 minutes on each side, until they are charred. Then transfer to a rimmed baking sheet and roast for 20-25 minutes, or until the stalks are soft and tender.
Meanwhile, toast the hazelnuts in a dry pan over medium heat for a few minutes until they turn glossy and start to brown. Then add the butter and Aleppo pepper. Lower the heat and cook for a few minutes, stirring frequently to ensure the hazelnuts don’t burn.
When the cabbage is ready, transfer it to a serving plate and spoon the chili butter and hazelnuts over the cabbage. Top with the black pepper, a little more salt, the parsley, lemon zest, lemon juice, and sprinkling of Aleppo pepper.