Open up the beans and sweetcorn, drain out the water and give them a quick rinse under the tap.

Grab a bowl and throw in the beans and sweetcorn. Chop up the red onion into slices and add this too.

Then we're going to add the oil and vinegar. A sploosh of each is perfect (a couple of tablespoons if you want to be precise about it).

And finally, add the chilli powder and salt and pepper. Give it all a mix together and you're done. You can eat right away, but it's better if you can chill it in the fridge for a bit first.