Heat the oven to 450 degrees.
Combine the cabbage, cauliflower and 2 Tbsp olive oil on a rimmed baking sheet. Season with S&P and spread evenly.
Place in the oven and set the timer for 10 minutes. After 10 minutes, give the mixture a stir, return to the oven and roast 5 minutes more.
Combine the chickpeas, onion and smoked paprika in a bowl, drizzle with olive oil and season with salt. Mix well.
Add the chickpea mixture to the baking sheet, mix all together and return to the oven for 5 minutes.
To make the dressing, combine all dressing ingredients to a bowl and whisk until smooth. Add 2-3 tsp water to thin, if needed and season with salt.
If at this point the vegetables are browned and a little charred, remove from the oven. If not, place the baking sheet under the broiler for a couple of minutes until there are some dark, charred pieces.
Remove the pan from the oven and add all to a serving bowl.
Add in the arugula, feta, dates, parsley & pistachios. Sprinkle over a big pinch of Aleppo pepper and mix.
Drizzle the dressing over all.