Shish Taouk With Toum Garlic Sauce

Name: Shish Taouk With Toum (Garlic Sauce)
Ingredients: 1 cup Greek style yoghurt; 3 cloves garlic, finely minced; 1 tablespoon tomato paste; 3 tablespoons lemon juice; 1/2 tablespoon zatar (thyme based middle-eastern spice mix); 1/2 cup extra virgin olive oil; 1/2 teaspoon kosher salt; 1/4 teaspoon ground coriander; 1/8 teaspoon pimenton (smoked paprika); 1 pound boneless and skinless chicken breasts or thighs; 12 crimini mushrooms; 12 papadew peppers; 12 cippolini onions, blanched and peeled; 2 zucchini, cut into large chunks; 2 blocks of halloumi cheese, cut into large chunks; 2 lemons for grilling, cut into rounds or wedges; 4 rounds of fresh Syrian bread; 1 bunch fresh thyme, finely chopped; 6 cloves of garlic; Juice of 1 lemon; Large pinch of kosher salt; 1 large egg white; 2/3 cups canola oil; small bowl of ice water; Up to 1/2 cup of good quality prepared mayonnaise