Empty pesto into a bowl and season with salt and pepper. Grate the Parmesan cheese and blend it into the sauce --- or scatter it on top, if you’re serving the pesto with your favourite pasta.
A little of this pesto goes a long ways. It's quite potent, especially if you went with two heads of garlic. When serving with pasta, I reserve a couple of tablespoons of the pasta's cooking water. After draining the pasta, I toss it back into the cooking pot, then add about half the pesto I think I will need with the pasta water. Blend well, coating the pasta evenly. Taste. You can add a little more pesto as you need it, but you'll be surprised how little it takes.
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