Ensalada de Aguacate Recipe from Cuba - Watercress, Avocado, Onion, and More

Ingredients

• watercress or lettuce leaves, for the platter (optional)
• 2 large Florida avocados or 4 Haas avocados , peeled, halved lengthwise, and sliced
• 1 small onion , sliced vertically
• salt , to taste
• Freshly ground black pepper
• 0.5 cup pure spanish olive oil or extra virgin olive oil
• 3 tbsp white vinegar or fresh lemon juice
• 1 tsp finely chopped parsley