Using heavy duty aluminum foil, create two 12x12 or so trays that
will be used to hold the candy while it hardens.  Cover both generously
with confection sugar.

In large saucepan mix white sugar, corn syrup (Karo), and water,
heating over medium-high, stirring until sugar has dissolved.

Stop stirring and allow to boil on it's own, until thermometer reads 300-310 F range.  Remove from heat

Carefully stir in cinnamon or whatever flavoring oil you like
slowly.  Pouring in the oil will generate a large amount of steam from
the oil which you do not want to breath in.  Do the same with the food
coloring.  Pour into foil trays, sprinkle with more confection sugar
when slightly hardened.  Crack into pieces and keep in sealed container
for maximum freshness.