Granadilla (aka passion fruit) Tropical Smoothie

I had granadilla (passion fruit) flavoured yoghurt this time instead of greek, and so thought I'd try it in a smoothie.  Here goes!

3 bananas
3-4 pineapple rings, cored
2 heaped dessert spoons granadilla yoghurt (or more according to your taste)
1 cup orange juice
3 tbs ground flax seeds

Blend together.  Yum-ums.  Makes 2 large smoothies.