Bring a medium saucepan of salted water to a boil. Add the haricots verts and cook until crisp-tender, about 3 minutes. Drain and rinse under cold water; transfer to a paper towel-lined plate. Refill the pot with water and bring to a simmer.
Meanwhile, cook the bacon in a large nonstick skillet over medium-high heat, stirring occasionally, until browned, about 5 minutes. Remove with a slotted spoon and drain on paper towels. Pour the drippings into a large bowl; whisk in 2 tablespoons vinegar and the mustard until smooth. Add the frisee, endive, haricots verts, herbs, shallot, bacon, 1/2 teaspoon salt and a few grinds of pepper; toss.
Add the remaining 1 tablespoon vinegar to the simmering water. Reduce the heat to low. Crack each egg into a ramekin or teacup, then gently slip into the water. Cook until the whites are set but the yolks are still runny, about 3 minutes. Remove from the heat.
Divide the salad among plates. Remove the eggs with a slotted spoon, blot dry on a paper towel, then transfer to the salads. Season with salt and pepper and serve with the baguette.
Photograph by Justin Walker
Recipe courtesy of Food Network Magazine