This turned out great! Its a bit red, I did use a _lot_ of raspberries and so it is super tart, but then again I'm not opposed to raspberries without any sugar so I like it a lot. Thinking of taking a liter to back sweeten though just to give it a try, what would be the best way to do this? Just dump in some regular table sugar after I pour? Don't want to mix it in too much though, might ruin the carbonation?