Mix the cinnamon into the flour. Set aside.
Warm honey and sugar in a heavy pot until bubbling. Add toasted almonds, chopped candied fruits, lemon zest (optional).
Use the rum to dissolve the ammonium bicarbonate leavening. (https://bakerpedia.com/ingredients/bakers-ammonia/)
(or use 1 part baking powder plus 1 part baking soda.)
Add the dissolved ammonium bicarbonate to the honey mixture. Then add the cinnamon-flour. Mix well until it is all moist.
We baked these immediately at 350F for 12-14 minutes.