Naamas Fattoush Recipe

Name: Na'ama's Fattoush Recipe
Ingredients: scant 1 cup/200 g Greek yogurt; 3/4 cup plus 2 tbsp/200 ml whole milk; 2 large stale Turkish flatbread or naan (9 oz/250 g in total); 3 large tomatoes (13 oz/380 g in total), cut into 2/3-inch/1.5cm dice; 3 oz/100 g radishes, thinly sliced; 3 Lebanese or mini cucumbers (9 oz/250 g in total), peeled and; chopped into 2/3-inch/1.5cm dice; 2 green onions, thinly sliced; 1/2 oz/15 g fresh mint; scant 1 oz/25 g flat-leaf parsley, coarsely chopped; 1 tbsp dried mint; 2 cloves garlic, crushed; 3 tbsp freshly squeezed lemon juice; 1/4 cup/60 ml olive oil, plus extra to drizzle; 2 tbsp cider or white wine vinegar; 1/2 teaspoon freshly ground black pepper, plus more to taste; 1 teaspoon fine grain sea salt, plus more to taste; 1 tbsp sumac or more to taste, to garnish