Hold a sweet corn ear firmly and slice off the kernels with a sharp knife, listening for the satisfying snap as they hit the bowl.
Add the finely chopped red onion and sprinkle in the chili powder, mixing well to combine the bright, crunchy bits with the spicy aroma.
Squeeze fresh lemon juice over the mixture, watching the vibrant color brighten as the tangy liquid coats everything evenly.
Stir in the roughly chopped cilantro and a pinch of salt, ensuring all the ingredients are evenly coated and flavors meld together.
If using, sprinkle the amchur powder over the chaat for a subtle fruity tang, then give it a final gentle toss.
Taste and adjust salt or lemon if needed, then serve immediately to enjoy the crisp, smoky, tangy flavors with a burst of freshness.