Cucumber, Tomato & Avocado Salad

Ingredients

• 2 medium cucumbers, peeled and thinly sliced
• 2 cups grape or cherry tomatoes, slice in half lengthwise
• 2 tablespoons balsamic vinegar
  
• 1/2 red onion, thinly sliced 
  
• 1/2 cup kalamata olives 
• 1 avocado 
• 1/2 cup of celery, chopped (optional 
• 1/4 teaspoon black pepper
• 1 lemon, juice and squeezed
• Himalayan or sea salt to taste
• 1 tablespoon extra-virgin olive oil (optional)