1. In a medium skillet, cook bacon over medium heat until crisp, 3 to 5 minutes. The bacon may also be cooked in a 425-degree oven on a rack over a rimmed baking sheet until crisp, about 15 minutes. Transfer to a paper towel-lined plate to drain. Let cool, then cut into 1/2-inch pieces, and set aside.

2. In a large bowl, whisk together vinegar, mustard, salt, and pepper. While continuing to whisk, drizzle in olive oil until thickened. Add lettuce, and toss to coat. Place on a large serving platter. Arrange remaining ingredients on lettuce as desired, and season with salt and pepper. Serve immediately.