A distinguished culinary classic crafted with authentic techniques and finest ingredients, offering rich depth of flavour and elegant presentation.
Poach chicken breasts in salted water with an onion and celery for 20 minutes; remove, shred into thick pieces, and reserve 2 cups of rich chicken broth.
Blend the soaked bread slices with evaporated milk and ground walnuts in a blender until silky smooth.
Heat vegetable oil in a pot over medium-low heat; cook chopped onion and garlic for 8 minutes until translucent; stir in blended ají amarillo paste and cook for 5 minutes until oil floats.
Pour the blended bread-walnut-milk mixture into the pot, stirring constantly on low heat as it thickens into a luxurious golden sauce.
Fold in the shredded chicken and grated Parmesan cheese; season with salt and pepper; simmer gently for 5 minutes until piping hot.
Arrange sliced boiled potatoes on a warm plate; ladle generous golden Ají de Gallina over the potatoes; garnish with hard-boiled egg halves, Botija black olives, and serve with white rice.