Caramel ice cream with caramel swirls. Our cows are not treated with rBST (no rBST). The FDA has said that no significant difference has been shown between milk derived from rBST-treated and non rBST-treated cows. Our Delicious Story: The 70's: It's 1976 and two childhood friends open their first ice cream parlor as a double rainbow lights up the San Francisco Sky. The 80's: A little recognition never hurts. Double Rainbow gets voted best ice cream in America. The 90's: Some local love. The mayor of San Francisco proclaims Double Rainbow as the city's official ice ream. 'Til Infinity: We remain a family owned business and continue our tradition of making award winning ice cream, using only the best ingredients. Thank you for being a part of our story. doublerainbow.com. (at)doublerainbowicecream.