In a large pot, bring water to boil. Add shucked cor to the pot and boil for 3 minutes.
Remove corn from the boiling water and shock it in an ice bath. This will retain its bright yellow color and stop the cooking.
While waiting for the corn to cool, dice the red onion and the green pepper. Set aside.
When the corn is cool, remove the kernels of corn from the cob with a sharp knife and add them to a large bowl.
Add the onions and the pepper to the bowl.
Drizzle the apple cider vinegar and olive oil over the corn salad and add the salt and pepper. Toss well to combine.
Just before serving, cut fresh basil into chiffonades, sprinkle over the salad and toss well.