Begin by washing and dicing your ripe Roma tomatoes, then place them in a large mixing bowl. Add the minced garlic, extra-virgin olive oil, balsamic vinegar, and a sprinkle of kosher salt. Mix gently to combine all the flavors, and allow the mixture to marinate for about 10 minutes, stirring occasionally.

Preheat your broiler to high. While it heats up, slice the French baguette into 1/2-inch thick pieces. Lightly dip one side of each slice in olive oil, ensuring they're evenly coated. Place them on a baking sheet, oiled-side up, and broil for about 1 minute or until they turn golden brown.

Once your crostini are nice and crisp, remove them from the oven and let them cool slightly. Arrange the toasted slices on a serving platter, then generously top each piece with the marinated tomato mixture. Sprinkle additional sliced fresh basil over the bruschetta. Serve immediately.