1/2 cup plain, unflavored, low fat yogurt (preferably organic). Do not get the kind that is sweetened, that's just nasty!
3/4 1% organic milk
1-2 T flax seeds
1 banana (medium to large)
2 handfuls (about 3 cups) frozen strawberries
1-2 t real vanilla
Put the flax seeds in the blender, "liquify" until they are ground. Add the yogurt, milk and vanilla and blend until mixed. Add the banana and the strawberries. You may need to use the "ice crush" function at first. Finish with liquify.
To get a texture that's almost like sorbet, use a frozen banana. An overripe banana will yield a sweeter product.
I find this is a great way to get some extra fiber, fruit servings and dairy.