4 cups plain whole milk yogurt (1 quart container of non-Greek yogurt or 1/4 of a homemade batch)
1 1/2 cups water
1/2 teaspoon salt
1 egg
2/3 cup medium grain rice, rinsed (e.g., Calrose)
1 stick melted butter (or to taste)
Find it online: https://cardamomandtea.com/559/traditional-gurdthu/