Have you seen this guy yet? The Vegan Black Metal Chef. As someone who drinks A LOT of vegan smoothies and enjoys heavy metal (although black metal not so much) I thought this video was fantastic.
I don’t really recommend using pasteurized concentrates though. (Pasteurized fruit juice is a whole ‘nother topic). Use real fruit whenever possible, frozen is the next best. Also, personally I like to sneak some lettuce or spinach in there to get extra nutrients without really changing up the taste.