Avocado with Celery, Apple, and Walnut Filling

Finely slice the celery and apple and immediately drizzle with 2 tablespoons of lemon juice. Add sour cream, vinegar, honey, allspice, salt, pepper, and chopped walnuts and mix well. Taste and adjust seasoning. Halve and peel the avocado, sprinkle with a little salt and drizzle with lemon juice. Place some lamb's lettuce on a plate. Place an avocado half on top and fill it with celery salad. Sprinkle with pepper and garnish with pomegranate seeds and fresh cress.