Crunchy Waldorf Guacamole

Name: Crunchy Waldorf Guacamole
Prep time: 20 min
Cook time: 2 h
Total time: 2 h 20 min
Cuisine: Mexican
Ingredients: 2 ripe avocados, peeled, stones removed and flesh mashed; 2 tablespoons lime juice; 1 small red skinned apple, halved, cored and finely diced; 2 celery sticks, trimmed and finely diced; 2 tablespoons freshly chopped coriander, plus extra sprigs to garnish; 2 tablespoons mayonnaise; 1/4 teaspoon salt; 30g walnut halves, lightly toasted and chopped