Step 1Combine the shallots, vinegar, lemon juice, salt and pepper in a medium bowl and stir to combine. Add the oil in a slow, steady stream, whisking constantly to combine. Taste for seasoning and add more salt, pepper or lemon juice if desired. This makes about one-third cup vinaigrette, more than is needed for the remainder of the recipe. Use the vinaigrette or transfer it to an airtight container and refrigerate it for up to 3 days. Bring it to room temperature before serving.
Step 1Adjust the oven rack to the center position and heat the oven to 325 degrees.
Step 2Lay the bacon on a baking sheet and cook it until it's done but still chewy, not crisp, 17 to 22 minutes, depending on the thickness of the slices. Remove the bacon from the oven and cut each strip into four pieces.
Step 3At the same time, scatter the hazelnuts on a baking sheet and place them in the oven to toast until they are golden brown and fragrant, 12 to 15 minutes. Remove the hazelnuts and set them aside until they are cool enough to touch. Gather the hazelnuts into a clean dish towel and rub them together inside the towel to remove the skins. Place the hazelnuts in a small bowl, drizzle with the hazelnut oil, sprinkle with a pinch of salt and toss to coat the nuts with the seasoning.
Step 4Remove and discard any bruised or unappealing outer leaves from the lettuce heads. Break the remaining leaves off from the cores, putting them into a large, wide-mouthed bowl, and discard the cores. Season the lettuce with salt, drizzle with one-fourth cup of the vinaigrette and the lemon juice, and toss the lettuce with your hands to coat it with the dressing, gently massaging the seasonings into the leaves.
Step 5Slice the eggs with an egg slicer or a large sharp knife and lay the slices out on a cutting board. Sprinkle the egg slices with salt, grind a turn of pepper over each slice, and sprinkle with the chives.
Step 6To build 4 individual salads, place 2 of the largest leaves on the bottom of each of 4 plates, cupping one inside the other to create a bowl. Place 2 egg slices, 2 crumbled bits of the Gorgonzola and 2 pieces of bacon inside each "bowl." Place 2 lettuce leaves on top of the first layer and repeat, building 2 more layers just like the first, using medium-size leaves for the second layer and reserving the smallest leaves for the top. Alternatively, build the salad in the same style on one large platter and serve it family style.