Cook the cleaned Brussels sprouts in boiling salted water for 10-15 minutes until al dente, boil the eggs until they are waxy.
Mix the vinegar with mustard, salt, pepper and 1 tablespoon of oil.
Dice the onions and cut the bacon into fine strips, sauté both in 2 tablespoons of hot oil until translucent. Stir in the vinegar and mustard mixture and set aside.
Turn the well-drained Brussels sprouts in the bacon sauce, place lukewarm in a bowl and garnish with egg eighths and serve sprinkled with fresh Parmesan.