Wash and prepare all produce as needed.
Chop the Persian cucumbers into bite-sized pieces.
Slice the strawberries and red onion thinly.
Shred the red cabbage and julienne the fresh mint leaves.
Add the baby spinach, cucumbers, strawberries, red onion, cabbage, and mint to a large serving bowl.
Drizzle the balsamic vinegar, fresh lemon juice, and olive oil evenly over the salad.
Season with salt and freshly ground black pepper.
Gently toss until all ingredients are coated in the dressing.
Top the Balsamic Strawberry and Feta Salad with chopped avocado and crumbled feta cheese.
Garnish with additional black pepper if desired.
Serve immediately and enjoy.