Preheat the oven to 375 degrees F. Spread the pesto on the cut side of the bread and place on a baking sheet. Transfer to the oven and bake for 10-15 minutes or until the bread is golden and toasted. Meanwhile, in a medium bowl, toss the tomatoes with the olive oil, balsamic vinegar, oregano, and garlic, season with salt and pepper.Break the balls of burrata over the toasted bread and spread evenly. Top evenly with tomatoes and finish with fresh basil. Season to taste with a little flaky salt. Enjoy!