My bad for the delay: I think it is flavor apprentice toasted almond flavor, got it from RTS vapes. Peanut butter works as well. Similarly, for fruit/sweet flavors you can use a spot of huckleberry or cucumber flavor to shine them right up. Even people who are not interested in DIY should keep these flavors around, as 90% of juices you would otherwise dislike can be salvaged with these flavorings. Can save a lot of ducats, especially for those who like to sample many flavors (& thus end up with many undesirable ones).