Prepare the yogurt by straining it overnight in the refrigerator to remove excess whey for a thick consistency.

Combine finely chopped carrots and purple cabbage in a mixing bowl, add strained yogurt, salt, and optional pepper, and mix gently.

Take slices of bread and spread avocado cilantro dressing or green chutney on one slice, add veggie mixture, and top with another slice of bread.

Cut sandwiches into halves or quarters and keep them covered until ready to serve.