Preheat the oven to 450F or 425F convection. Line a baking sheet with parchment paper.
Add cauliflower, 1 tablespoon olive oil, and ½ teaspoon salt to the baking sheet and toss to coat. Bake for 15 minutes, or until slightly charred in spots. Let cool off.
In a large bowl, add the yogurt, remaining 1 tablespoon olive oil, mustard, lemon, curry powder, black pepper, turmeric, and remaining ¾ teaspoons salt. Whisk until smooth.
Add the cauliflower, chickpeas, carrot, celery, and cilantro and toss to coat in the dressing. Taste and add more salt, pepper, or lemon, if needed.
Serve as a simple salad (you could add arugula or eat as is) or put it on top of some toast. Top with pickled red onions and more black pepper.