3 cups strained plain yogurt* or Greek-style yogurt
2/3 -3/4 cup sugar (depends on how tangy you want it)
Mix together the yogurt, sugar. Stir until the sugar is completely dissolved. Refrigerate 1 hour.
Freeze in your ice cream maker according to the manufacturer's instructions.
*To make strained yogurt, line a strainer with a few layers of cheese cloth. Gather the ends and fold them over the yogurt, then refrigerate for at least 3 hours. So, for the above recipe start with and strain 6 cups of yogurt.