Preparation Whisk together mayonnaise, capers, mustard, anchovy paste, tomato paste, pepper, and 1 tablespoon vinegar in a bowl. Drain oil from tuna into a bowl and whisk in remaining 2 tablespoons vinegar. Brush insides of all roll halves generously with mixture. Add tuna to mayonnaise mixture and stir to combine. Make sandwiches with lettuce, tomato, egg, and tuna mixture on a work surface. Weight sandwiches with a heavy cutting board, large plate, or platter for about 10 minutes.
Preparation Whisk together mayonnaise, capers, mustard, anchovy paste, tomato paste, pepper, and 1 tablespoon vinegar in a bowl. Drain oil from tuna into a bowl and whisk in remaining 2 tablespoons vinegar. Brush insides of all roll halves generously with mixture. Add tuna to mayonnaise mixture and stir to combine. Make sandwiches with lettuce, tomato, egg, and tuna mixture on a work surface. Weight sandwiches with a heavy cutting board, large plate, or platter for about 10 minutes.