Idle Language Wondering

This morning I was emailing my daughter telling her what I had put in my fruit crisp last night. As I reviewed what I wrote, it made me wonder.  

Here you have three of the fruits in the crisp. A blue berry - so named because it is blue. A black berry - so named because it is black. And a strawberry - so named because it is ________ ??????? Doesn’t look like straw. Doesn’t taste like straw. Red, juicy and delicious ~ and somewhere along the language line we called it a strawberry. Hmmmm? Any ideas?