Peel and chop the eggplant in cubes. Boil it in slightly salted water for about 5 minutes or steam it for about 10 minutes. Remove the eggplant with a skimmer and don’t toss the water.
Drizzle a pan with oil and sauté the minced onion for a minute. Add the drained eggplant and sauté for 2-3 minutes more.
Meanwhile, add more salt to the boiling water and toss the pasta in. Cook according to the packaging instructions, until al dente.
Transfer the eggplant and onion in a blender, season with salt and pepper and add the tablespoons of milk. Blend until you get a smooth cream. Add a few tablespoons of pasta water to make it thinner if needed.
Drain the pasta and mix it with the creamy eggplant sauce. Serve with abundant grated Parmigiano cheese on top.
Notes
You can store leftovers in an airtight container in the fridge for 2-3 days. Add a couple of tablespoons of water to the pasta before reheating to make it creamy again.