Grilled Naan and Tomato Party

Name: Grilled Naan and Tomato Party
Ingredients: 3⅔ cups (416 g) all-purpose flour; 1 Tbsp. plus 2 tsp. Diamond Crystal or 1 Tbsp. Morton kosher salt, plus more; 1 Tbsp. plus 1 tsp. sugar; 1 ¼-oz. envelope active dry yeast (about 2¼ tsp.); 2 cups plain whole-milk Greek yogurt, divided; 3 Tbsp. plus ½ cup ghee or unsalted butter, divided; 5 large tomatoes (2½–3 lb.), preferably heirloom, divided; 3 tsp. nigella seeds, divided; 2 garlic cloves; 1 Tbsp. fresh lime or lemon juice; 1 tsp. coriander seeds; 1 tsp. mustard seeds; Flaky sea salt