Roast (optional): Preheat broiler to high (≈500°F/260°C). Char whole peppers 6–10 minutes, turning every 2–3 minutes until skins are blistered and blackened. Steam in a covered bowl 10 minutes, then peel, seed, pat dry, and cool completely.
Toast & prep: In a dry skillet over medium heat, toast walnuts 2–3 minutes until fragrant; cool. Pulse oats in the processor to fine crumbs; add ground flax and pulse to combine.
Bloom spices: Over low heat, warm 1 tsp EVOO with the garlic, Aleppo, and cumin 30–45 seconds until aromatic but not browned; scrape into the processor.
Build the base: Add cooled peppers, remaining EVOO, chopped date, lemon juice, vinegar, and optional sumac. Pulse, then process until mostly smooth but not pasty.
Set the texture: Add the oat–flax mixture; pulse in short bursts until the dip thickens and holds gentle peaks. Season with a pinch of salt if needed and black pepper to taste.
Rest & finish: Let stand 10 minutes so oats/flax hydrate. Spoon into a shallow bowl, swirl, drizzle with EVOO, and garnish with chopped walnuts, a pinch of Aleppo, and mint. Serve with warm pita or vegetables.