Nicoise Salad Sandwich

Name: Nicoise Salad Sandwich
Ingredients: 3 tablespoons mayonnaise (preferably the olive oil kind); 1 splash white wine vinegar; 1/2 teaspoon anchovy paste; 1 teaspoon Dijon mustard; 1 teaspoon capers, drained; 2 ciabatta buns; 2 5 1/2 ounce cans tuna in oil; 1 radish, thinly sliced; 1 hard cooked egg, thinly sliced; 6 black olives (like Nicoise or Kalamata), pitted and lightly crushed; 2 thin slices red onion; 6 pickled green beans; 2 leaves of Romaine lettuce; Sea salt and freshly cracked black pepper to taste