Season the steak with sea salt and black pepper. Cook to desire texture.
Let the steak rest for about 5 minutes after cooking.
In a small bowl, combine the olive oil, lemon zest and juice, garlic, mint and salt and pepper to taste.
Thinly slice the steak crosswise.
On individual plates, top a pile of salad greens with the cucumbers, red bell peppers, green onions, and steak. Drizzle the vinaigrette on top and serve.