Lobster Rolls with Bacon, Tomato and Caper Mayonnaise

1/2 cup mayonnaise  

1/2 tsp. Dijon mustard 

1 1/2 tsp. capers, drained and coarsely chopped 

2 tsp. finely chopped fresh flat-leaf parsley 

1/4 tsp. anchovy paste 

6 high-quality bacon slices 

6 small soft rolls, ideally oblong in shape 

1/2 lb. freshly cooked lobster meat, cut or torn into small chunks 

2 small tomatoes, diced