Top the lettuce with the strawberries, blueberries, walnuts, feta and red onion.
In a food processor or blender, pulse together the vinaigrette ingredients until smooth.
Pour the vinaigrette over the salad, and toss to coat well before serving.
Notes
Dressing the salad just before serving is crucial to prevent wilting lettuce. This ensures that each leaf remains crisp and fresh, allowing the flavors of the berries and other ingredients to shine.Rinse the berries and pat dry gently before adding them to the salad. This removes any dirt or residue, leaving you with clean and fresh berries.Serve immediately. Berry salads are best enjoyed shortly after assembly to maintain the freshness of the ingredients.