3 heirloom or vine-ripened tomatoes, cut into ¼-inch slices
½ teaspoon sugar
½ teaspoon salt, divided
1 pound fresh mozzarella, cut into ¼-inch slices
Freshly ground black pepper, to taste
Extra virgin olive oil, for drizzling
Balsamic glaze, for drizzling
¼ cup roughly chopped fresh basil
Fresh basil sprigs, for garnish