Make Ahead
Dip (without toppings) can be made up to 2 days in advance; cover and refrigerate. Store tomatoes in a separate container. Let dip stand at room temperature for 30 minutes before topping and serving.
Make Your Own Crostini
Preheat oven to 350°F. Slice 1 baguette diagonally into ¼-inch-thick slices and arrange on a large baking sheet (it will be tight; use a second baking sheet if desired). Brush with olive oil on both sides and season with salt. Bake, rotating baking sheet halfway through, until golden, 16 to 18 minutes. Let cool completely. Crostini can be made up to 5 days in advance. Store in an airtight container at room temperature.
