Super BLT Bites on Sourdough with Tarragon Mayonnaise

slices of bread, sourdough or whatever you like 3 slices of bacon, thick, if you prefer 6 small tomatoes (I used Campari, a bit bigger than cherry) 1 leaf lettuce, your choice 1/2 cup mayonnaisse 1 teaspoon tarragon, snipped into small pieces