Preheat oven to 425 degrees F.
Make green hummus. Combine chickpeas with ¼ cup reserved canned chickpea liquid, tahini, arugula, parsley, dill, lemon juice, and garlic in a blender or food processor. Blend mixture until smooth. With the blender running, slowly add extra virgin olive oil and blend until smooth. Season hummus with salt and pepper and set aside.
Toss cauliflower florets and sliced red onion with 3 tablespoons olive oil, oregano, garlic powder, salt, and pepper. Spread in an even layer on baking sheet and roast for 20-25 minutes or until charred and softened.
Remove vegetables from oven and toss with peppadew peppers, olives, extra virgin olive oil, red wine vinegar, and red chili flakes. Season with salt and pepper and keep warm.
Prepare fried feta. Dip feta chunks in egg, turning to coat on all sides. Remove feta with a fork and coat with flour. Dip in eggs again then coat in sesame seeds.
Heat 2 tablespoons oil in a small saute pan over medium-high heat. Cook feta until golden brown on all sides, about 5 minutes. Remove from heat and keep warm.
Whisk together honey with harissa seasoning until well combined. Drizzle honey on feta, reserving the rest for serving.
Toast pita bread and spread green hummus on one side. Top hummus with cauliflower filling and fried feta. Drizzle extra honey on top and garnish with fresh dill. Serve immediately.