Mix the ingredients for the dressing together well. When the spices in the lime juice have been mixed well and the salt has dissolved, add a little salad oil.
Cut the onion into rings. Cut the tomatoes and cucumber into cubes. Drain the corn and mix everything together. Mix in the coriander.
Cover and let the salad rest in the refrigerator for 1 hour. Stir gently a few times in between
* Chat Masala - mix a small stock mixture of 1 teaspoon mango powder, 1 teaspoon cumin powder, 1/2 teaspoon black pepper and 1/2 teaspoon salt