This looks amazing! I'll have to make it before the summer's watermelon is done. Rosemary sounds like such an interesting addition to an already delicious drink.
oops! you're right--i mean squash & not crush. My simple recipes was inspired by "Lime Squash", which I discovered on a menu in Antigua and/or India. They actually squeezed the lime into seltzer at the table, and left sugar. Kind of like this recipe: http://www.marthastewart.com/348665/lime-squash-drink