Blueberry Salad with Spinach, Feta, and Balsamic Dressing

0 To make the balsamic dressing, whisk together balsamic vinegar, lemon juice, minced garlic, salt, and pepper in a bowl. While whisking constantly, slowly drizzle in olive oil until the dressing is fully emulsified, and set it aside.
1 In a large salad bowl, combine the baby spinach, red lettuce, sliced red onion, and blueberries. Drizzle with the prepared dressing, then toss thoroughly to evenly coat the greens.
2 Add the raspberries, avocado, feta cheese, and toasted pecans. Give the salad one final, gentle toss to incorporate these delicate ingredients without bruising the berries or breaking up the cheese.
3 Taste for seasoning and serve right away.