Lettuce, apple, and cucumber salad

Ingredients

• 2 cups iceberg lettuce, chopped finely
• 1/2 a large apple, chopped
• 1 cucumber, sliced
• 2 tablespoons black olives, chopped
• Handful of mint
• Tablespoon of olive oil
• Juice of two limes
• Handful of fennel leaves
• Handful of walnuts