In a large salad bowl, place the tomatoes and the butter lettuce. Add 1 to 2 tablespoons of shallot vinaigrette and mix gently well. Place the salad on a serving plate and add the hardboiled egg, avocado slices and the crumble blue cheese. Add a touch of the vinaigrette in top of the egg. Spread some of the blue cheese on the toasted French baguette and serve alongside.