Heat up a large pot of water over medium-high heat and season it generously with salt. Make sure to take off the husk and all the silk threads from the ears of corn before cooking.
Once water starts to boil, lower the heat to medium-low and add corn. Cover the pot and let corn cook for about 10 minutes, until tender.
Take all the corn out onto a cutting board and let it cool enough to be handled.
Cut Corn Off the Cob:
To cut corn kernels off the cob, stand corn up in a large mixing bowl cut side down. Slice the kernels off with a sharp knife from top to bottom, close to the part where kernels attach to the cob. Turn the ear of corn and repeat slicing the kernels off all the way around.
Make Corn Salad:
While corn is cooling off, chop tomatoes in half or in fours and slice the shallot thinly. Mince basil and squeeze out fresh lemon juice.
Once corn kernels are ready, mix everything together in a mixing bowl and serve!