1. Chop the onion. It doesn't have to be finely minced, but the pieces shouldn't be too large. You then can chop by hand or put them in a mini Cuisinart and pulse about 5 or 6 times until the onions are chopped- this is a big-time saver.
2. Peel and chop the garlic cloves. Again, a rough chop is fine. You could also pulse a few times in the mini Cuisinart after chopping the onion.
3. Prepare the tomatoes. Traditionally this dish is made with fresh tomatoes blanched, peeled, then chopped. But here's a timesaving tip for you. You can use cherry or grape tomatoes and pulse them in a mini Cuisinart in small batches. Fill the Cuisinart about 1/3 of the way so they chop evenly. You do not want to puree them, merely chop them. Pulsing about 3-4 times is sufficient. You can prepare your tomatoes in about 3 minutes.
Alternatively, if you have homemade tomato sauce, you can use that in place of the fresh tomatoes. However, I don't recommend canned tomatoes because the taste won't be as good.
4. Prepare your bread. Cut or break stale bread into small pieces. I like to keep homemade croutons in the freezer for this dish. You can add the croutons to the pan while they are frozen.
5. Heat about 2-3 tablespoons of olive oil in a skillet over medium heat.
6. Once the oil is warm, add the onion and sauté for about 6 or 7 minutes until the onions are soft and translucent but not browned.
7. Add the chopped garlic and cook for about a minute. This allows the flavor of the garlic to open up.
8. Add your chopped tomatoes or tomato sauce to the pan and stir with the onions and garlic. Cook until most of the tomato water has evaporated. This should take about 10-15 minutes.
9. Add your bread cubes or croutons, the fresh basil, and sea salt or Celtic salt. Stir.
10. Cook for a few more minutes so that everything is well incorporated, and the bread or croutons soak up the juices.
This can be made ahead of time, and it can be served cold or at room temperature. When you're ready to serve, add fresh burrata on top or fresh mozzarella. The better the mozzarella, the better the dish.
Try to buy mozzarella in water. You can put a large ball of mozzarella or bread on top, serve a family-style, and slice the cheese when you serve everyone.
This is also an elegant dish to serve in individual servings. Slice the cheese on top of each serving, or serve a medium-sized mozzarella ball called Bocconcini.