In a bowl take gram flour, jowar flour, rice flour, ragi flour, sesame seeds, grated coconut and curd. Whisk the ingredients well. Pour water as required and whisk it well to avoid formation of lumps in the batter. Sprinkle salt and black pepper to taste. Mix it and keep the batter aside. After 15 minutes add baking soda. Grease the idli moulds with oil. Pour the batter in each mould and leave it to cook. In a blending jar, take coriander leaves, green chillies, sesame seeds, garlic, salt, oil and water. Blend all the ingredients till it turns into a paste. Multi grain idli is ready to serve.