Rinse the mixed salad greens thoroughly under cold water to remove any dirt or residual pesticides. Gently pat them dry with a kitchen towel or use a salad spinner.

Rinse the fresh blueberries and remove any stems. Check for any spoiled berries and discard them.

Using a knife and cutting board, thinly slice the red onion. If you prefer a milder flavor, soak the slices in cold water for a few minutes before draining.

If you have unsalted pistachios, feel free to give them a rough chop to expose more surface area. Crumble the feta cheese in a bowl.

In a small bowl or jar, combine the extra virgin olive oil, honey, balsamic vinegar, Dijon mustard, salt, and black pepper. Whisk or shake until well blended. Adjust the seasoning according to your preference.

In a large mixing bowl, combine the mixed greens, blueberries, sliced red onion, pistachios, and crumbled feta.

Drizzle the dressing over the salad just before serving. Toss gently to ensure everything is well coated, being careful not to mash the blueberries.

Transfer the salad to a serving bowl and enjoy!