Avial is a mixed vegetable curry in a mildly spiced coconut yogurt sauce that is part of everyday and special meals in the Southern Indian state of Kerala. Master Kerala Style Avial Recipe - Onam Sadya Recipe with our comprehensive recipe guide. Includes ingredients, step-by-step instructions, cooking tips, and nutrition information. avial recipe with mixed vegetables.kerala style aviyal recipe a traditional side dish served as sidedish to rice.how to make avial recipe. Avial or Aviyal is a traditional Kerala side dish served as an accompaniment to rice. It is an easy to prepare vegetarian dish.