Preheat 1 litre sunflower oil in a deep-fat fryer or large kadai.
Add 140 g chickpea flour, 2 tablespoons rice flour, ½ teaspoon ajwain, ¼ teaspoon turmeric powder, ¼ teaspoon red chilli powder, and ¼ teaspoon chaat masala to a large bowl. Slowly whisk in 150 ml water, plus 2 tablespoons (to adjust consistency) to form a smooth, thick-yet-flowing paste.
Once the oil is hot (test with the tip of a wooden spoon or chopstick; if the oil bubbles around the wood, it's ready) dip 40 g baby spinach leaves in the batter until well coated. Carefully drop in the oil.
Fry the spinach leaves until golden brown. Don't overcrowd the oil! Drain on kitchen paper.
Quickly mix the sweet yogurt chutney by combining 140 g full fat natural yoghurt, 2 tablespoons sugar, 1 pinch salt, and 1 tablespoon water in a small bowl.
Place the crispy spinach leaves on a plate, then top with the sweet yoghurt, 2 tablespoons green chutney, 2 tablespoons tamarind chutney, 40 g red onion, 2 tablespoons nylon sev, 20 g pomegranate arils, and 1 handful fresh coriander. Alternatively, you can let everyone add the toppings as they wish.
Notes
I don't recommend cooking palak chaat in an air fryer or oven, as the batter is too wet.