Rub some oil over the corn and griddle, grill or barbecue it. Let it cool, then using a sharp knife cut off the kernels.
Rinse and drain the kidney beans, put them in a mixing bowl.
Chop the tomatoes, spring onions and jalapeno rings. Add these to the bowl.
Whisk the oil, lime juice, spices and garlic together. Drizzle this over the salad, then season to taste with salt and pepper. Mix in the coriander.
Leave it for a couple of minutes, then taste it. Adjust the seasoning, heat, lime juice according to your liking.
Serve with a lime wedge.