Make the tofu feta by stirring the lemon juice, garlic, and salt together in a medium bowl. Add the tofu cubes and gently toss to coat. Allow the tofu to marinate for at least 30 minutes.
While the tofu marinates, make the dressing by whisking all ingredients together in a small bowl or placing them into a sealed jar and shaking until well mixed.
Place the chopped romaine lettuce into a large bowl and add the tomatoes, cucumber, red onion, and olives. Drain the tofu feta and add it to the bowl. Drizzle with the dressing and gently toss to coat everything.