Use the ripest, most flavorful tomatoes you can find—summer tomatoes make the biggest difference. To avoid soggy bruschetta, keep the topping and toast separate until serving. Leftover tomato topping keeps refrigerated for up to 2 days; stir before using (it may release liquid). For a sweeter balance, add a tiny pinch of sugar if tomatoes are bland. Great with a drizzle of balsamic glaze or reduction.