Preheat the oven to 400˚F. In a large mixing bowl, toss the bread cubes with 2 tablespoons of olive oil and sprinkle with sea salt. Arrange the bread on a baking sheet and toast in the oven for 9 to 12 minutes until the edges turn golden and crisp while the centers dry thoroughly. Allow to cool completely. In a separate small bowl, whisk together the vinaigrette ingredients until well emulsified, then let the flavors develop while you prepare the salad. In the same large mixing bowl, combine the tomatoes, red onion, fresh mozzarella, and chopped basil. Add the cooled toasted bread cubes. Roughly 10 to 15 minutes prior to serving, pour the vinaigrette over the salad, adding it gradually to taste. Toss gently until everything is well coated. Garnish with additional basil leaves if desired.
Notes
Opt for a hearty bread such as Sourdough or Ciabatta to ensure the croutons retain their texture and resist becoming overly soggy.