1 small Little Gem lettuce, leaves separated
1 avocado, peeled, stone removed, sliced
2 tomatoes, preferably a sweet, deep-flavoured heirloom variety, thinly sliced
1½ tbsp mayonnaise
salt and black pepper
1 tsp Chipotles en adobo sauce
1 tbsp extra virgin olive oil
1½ tbsp soured cream
1 large chicken breast, skin removed
2 large slices sourdough bread