Step 1

Combine tomatoes and minced garlic in a large bowl. Season generously with salt and pepper. Add 3 Tbsp. oil and vinegar; toss to mix well. Cover and let tomatoes marinate at room temperature, stirring occasionally, for 2–3 hours to allow flavors to develop.

Step 2

Rub one side of toasted bread with cut sides of remaining garlic clove; drizzle bread with oil and cut in half crosswise. Add basil to tomato mixture in bowl and toss well. Season to taste with salt and pepper. Arrange crostini on a platter. Spoon some tomato mixture on top of each crostini.