Preheat oven to 300.Arrange bacon on a baking sheet lined with tin foil.
Bake for thirty minutes turning once.Set aside and let cool.In a small bowl combine flax seed oil, balsamic vinegar, whole grain mustard, and salt and pepper. Set aside.
Place strawberries, cucumber, mixed greens, arugula and bacon in a large salad bowl and toss lightly to combine.
Add the dressing and toss to coat.Divide the salad amongst four plates and serve topped with avocado and crushed pretzels.