Sprinkle the salmon fillet with salt and pepper then grill, bake, or pan fry it until just cooked and flakey. Let the salmon cool to room temperature then use a fork to flake it apart.

Preheat oven to broil. Place the bread cubes on a baking sheet then drizzle with a little olive oil (I used a couple teaspoons) and sprinkle with salt and pepper. Toss the bread cubes in the oil, salt, and pepper until coated then spread them out into a single layer and broil them in the oven until golden and crisp. Remove from the oven and let them cool.

In a large bowl combine the cucumber, tomatoes, red onion, and salmon. In a small bowl or jar whisk together or shake all of the ingredients for the dijon vinaigrette. Pour the dressing over the salad and gently toss together. Just before serving add in the toasted bread cubes and toss everything together.