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Caramelize the Onions: Slice the onions and cook them in butter over medium heat until they are caramelized, about 40 minutes. (use a shortcut method if you can't wait)
Prepare the Sauce: In a blender, combine the caramelized onions, olive oil, egg yolks, grated Parmesan cheese, water, salt, and pepper. Blend until smooth. Add more water to thin it out a little if needed. I would also recommend adding the water in parts throughout the blending process, so you don't get a runny sauce.
Combine and Heat: Toss the cooked pasta with the sauce in a large pan. Warm over low heat for about 1 minute, then turn off the heat.
Serve: Garnish with fresh parsley if desired.