The tomato topping for these crostini is based on that of a "fettunta pomodoro" (a variation of bruschetta made with whole-wheat peasant bread) sampled at Florence's Cantinetta Antinori, owned by the well-know winemaking family.
To create visual variety for our presentation, we have made half of the crostini with the black olive paste on top and the rest with the red tomato mixture on top. Those who prefer a simpler recipe can sprinkle all of the bread slices with Parmesan before toasting (doubling the amount of cheese) and top all of the crostini with the tomato mixture and then the olive paste.