In a small glass bowl, mix together chopped tomatoes, red onion, 1 Tbsp olive oil and season with salt and freshly ground black pepper.
In a separate bowl, combine goat cheese spread, chopped cilantro and season with salt and freshly ground black pepper.
Slice the baguette into thin slices. Place slices in a large skillet over medium heat, drizzle with the remaining 2 Tbsp olive oil and toast the slices on both sides.
To assemble the crostini, spread the goat cheese spread on the toasted baguette slices, top with the tomato onion relish and finally top with the smoked salmon.