Preheat your oven to 425°F (220°C) and line a baking sheet with parchment paper.
Slice the cauliflower into 3/4-inch thick steaks, reserving any loose florets for extra roasting.
In a bowl, toss the cauliflower steaks and reserved florets with olive oil, turmeric powder, smoked paprika, salt, and pepper until evenly coated.
Spread the cauliflower in a single layer on the baking sheet and roast for 25-30 minutes, flipping halfway through until golden and crisp on the edges.
While the cauliflower roasts, drain and pat dry the chickpeas. In a separate bowl, toss them with a pinch of salt, pepper, and a few drops of olive oil.
Place the chickpeas on another baking sheet and roast in the oven for about 20 minutes, or until they become crispy.
For the tahini drizzle, combine tahini, lemon juice, minced garlic, a pinch of salt, and a splash of water in a small bowl, whisking until smooth and creamy.
Once the cauliflower steaks and chickpeas are done roasting, plate the steaks and top with the crispy chickpeas.
Drizzle the tahini sauce generously over the cauliflower and chickpeas, and serve warm.