Char your corn cobs in a dry skillet on high heat, turning occasionally
Once charred, cut off the kernels and place into a bowl (I find the best way to do this is to lay the corn down and slice off the kernels with a sharp knife - this way they don't fly all over)
Add your drained and rinsed beans, chopped onion, lime zest and cilantro to the corn and toss well
Taste for seasoning - When you use fresh and in season corn, you may find that you don't need any salt/pepper at all!