Pour olive oil, cider vinegar, kosher salt, many grinds of black pepper, and minced garlic in a medium-large bowl and whisk to combine. When corn is cool enough to handle (with a towel, if needed), cut the kernels from the cob and add to the dressing in the bowl. Scatter tomatoes, jalapeño, scallions, and herbs on top of the corn in layers, but I don’t bother mixing it at this point. I like the corn to marinate and gently pickle in the dressing while I cook the steak.