Raitha is a yogurt based chutneys usually used along with biryanis in India. Depending on the dominant ingredient used, it can be called as Cucumber raitha or tomato raitha or onion raitha etc... Here goes the recipe...
Yogurt - 1 cup
Cucumber( chopped) - 1 cup
Onion - 1 nos
Green chillies - 1 nos
Salt for taste
In a mixing bowl, add finely chopped cucumber, onion, green chillies. Pour over the thick yogurt. Add salt for taste. Mix well. Serve with biryani or pulav etc.
Add 1 more chilly if you'll like it bit spicy.