Remove meat from cooked, cooled lobster and place in a small bowl (1 1/2 lb lobster yields about 1 3/4 cups meat).
Add remaining ingredients and stir to combine.
Slice baguette into two 6 inch(15 cm ) lengths - slicing horizontally, almost but not completely through. Lightly butter baguettes and line with crisp lettuce.
Top with lobster filling and serve.