Squeeze out the grapefruit. You want about 1/2 cup or 100 ml. Wash the peel well, and then grate it. You want about 1/2 a tablespoon to a full tablespoon.
Take the grapefruit juice and the sugar, put them in a heat resistant dish, and microwave them for about 20 seconds. Then stir until the sugar dissolves.
Combine the ingredients from Step 2 with the yogurt and the grated grapefruit peel and stir well.
Pour the mixture into a shallow pan, freeze it, and it's done.
Story Behind this Recipe
I used Caspian Sea brand yogurt to make a healthy ice cream.
When you are freezing it, it helps smooth out the ice cream if you stir it a few times. If you stir it too many times though, it won't finish freezing so don't stir it too much. If it is a bother to stir it, you don't have to and it will still be fine. If it gets too hard, just pull it out for a little bit and let it approach room temperature. When it softens, it's ready to be eaten. I had this with ice cream and honey grapefruit. In step 1, I squeezed out the remaining grapefruit, mixed it with honey, and then dipped grapefruit in it.)It was delicious.