The best smoothie shop at the local mall says they use fresh strawberries and "strawberry juice" (along with ice and frozen yogurt) to make their strawberry smoothie. I just got a Blend-tec and I'm looking to re-create it. What is the "strawberry juice" they are likely referring to, and where should I look for it? I assume it's sort of syrupy stuff, not like a Ocean Spray type of drink. Or is it best to cook strawberries and reduce the cooked juice?