1. Cook the eggs for 8 minutes in a pot of boiling water, then plunge them into a bowl of ice water. Peel the eggs and set aside.
2. Remove the stems from the little gem lettuces, separate the leaves, wash them, and dry them. Roughly chop them and set aside.
3. Fry the bacon in a pan until crispy. Remove the bacon and keep the cooking fat in the pan.
4. Cut the chicken breasts in half lengthwise. Cook them in the pan with the bacon fat for 5-6 minutes, until golden brown. Season with salt and pepper. Set aside and slice.
5. Wash and dice the tomatoes and avocado. Add a squeeze of lemon juice to prevent the avocado from browning. Peel and thinly slice the red onion. Mix all the sauce ingredients in a bowl.
6. Arrange the little gem lettuce in a dish, then add the chicken, tomatoes, avocado, bacon, and quartered eggs. Crumble the blue cheese, sprinkle with sliced red onion and a few sprigs of chervil. Drizzle with the sauce.