Niçoise Salad Quiche

Name: Niçoise Salad Quiche
Ingredients: 1¾ cups flour; 8 tbsp. unsalted butter, cubed and chilled; 1 tsp. kosher salt, plus more; 1 medium Yukon gold potato, peeled and sliced ¼ thick; 7 green beans, trimmed and cut into 1 pieces; 1 head butter lettuce, trimmed and torn into 1 pieces; 1 (3 oz.) can tuna packed in water; drained; ½ cup heavy cream; ½ cup milk; 3 tbsp. olive oil; 1 tbsp. Dijon mustard; 3 eggs; 1 anchovy filet; 1 clove garlic, peeled; 1 small shallot, peeled; Freshly ground black pepper, to taste; 1 plum tomato, thinly sliced; ½ cup pitted Niçoise olives; Finely chopped parsley, for garnish