Step 1Lightly brush the baguette slices with 2 tablespoons of olive oil. Broil until lightly browned, 2 to 3 minutes.
Step 2Heat the remaining 1 tablespoon of oil in a medium skillet over medium heat. Add the tomatoes and saute, stirring frequently, for 5 minutes.
Step 3Using a mortar and pestle, mash the anchovies with garlic. Stir them into the tomatoes. Add the olives and capers and cook for 5 minutes, stirring constantly. Season with pepper to taste. Remove the mixture from the heat and let stand 5 minutes.
Step 4Stack the basil leaves and slice crosswise into fine strips.
Step 5Mound about 2 teaspoons tomato mixture onto each baguette slice. Strew with a little basil and serve.