Tomato Avocado Salad

• 1 lb Roma tomatoes, chopped
• 1 English cucumber, sliced
• ½ medium red onion, sliced fine
• 2 avocados, diced
• 2 Tbsp extra virgin olive oil
• Juice of 1 medium lemon
• ¼ cup (½ bunch) cilantro, chopped
• 1 tsp salt
• ⅛ tsp black pepper