Step 1

Prepare a grill for medium indirect heat.

Step 2

To make the bread bowl, slice off the top one-quarter of the bread with a serrated knife and set the top aside. Hollow out the loaf by cutting a circle around the inside of the bread, leaving a 1-inch border. Pull the soft bread out with your hands, making sure to leave about 1 inch intact at the bottom of the bowl as well. Reserve the bread pieces and the bowl.

Step 3

Combine the tomato paste, garlic, 1/2 teaspoon kosher salt, several grinds of black pepper and the red pepper flakes in a small bowl. Whisk in the olive oil until well combined. Brush the mixture all over the inside of the bread bowl and its top with a pastry brush. Fill with the cheese and replace the top.

Step 4

Grill the bread bowl until the cheese is completely melted, about 30 minutes. During the last 5 minutes of cooking, grill the reserved bread pieces until golden all over. Transfer everything to a serving platter and remove the top of the bread bowl. Top the cheese with the tomatoes and basil. Drizzle with more olive oil and some balsamic vinegar, then sprinkle with flaky salt.