Reddit link: https://www.reddit.com/r/DIY_eJuice/comments/3m3avb/mustard_cider_just_in_time_for_the_autumnal/
"You can of course tweak here and there, or add additional flavorings in small amounts. I wouldn't expect any substitutions to work very well – the three flavors here are fairly unique. FA Cinnamon Ceylon makes a nice addition if you like your cider spicier. Adding FA Brandy will give you a hard apple cider flavor. Play around!
The fundamental recipe is great example of building your recipes around base, heart, and top notes to form a cohesive flavor. Using only three flavors makes it simple to mix, and a great base on which to build your own personal adaptations."