Start by thoroughly washing the mixed salad greens under cold water, then gently pat them dry.

Gently rinse the fresh blueberries under cold water and allow them to drain in a colander.

Chop the shelled pistachios on a cutting board with a sharp knife.

In a large bowl, layer the mixed salad greens, blueberries, chopped pistachios, crumbled feta, and red onion.

In a mixing bowl, whisk together olive oil, honey, balsamic vinegar, Dijon mustard, salt, and pepper until emulsified.

Drizzle the dressing over the salad and toss gently to coat all ingredients.

Taste and adjust seasoning before serving immediately, or refrigerate for a short time to chill.