In a 8x8 glass pan, line with parchment paper. Set aside.On medium heat, combine all of the ingredients together except for the baking soda in a deep saucepan (keep in mind that when you eventually mix it in, the baking soda will make the recipe explode like lava--this is why you want a deep pot). Be sure to stir continuously.Once the sugar dissolves, turn heat up to medium-high heat until the mixture begins to boil. Do not stir at this point. Allow to boil for 5-7 minutes. It will be tempting to walk away but don't! After the 5 minute mark, the candy's temp will spike and you will burn it if you do not keep an eye on it.Once the mixture becomes a golden caramel color, immediately whisk in the baking soda until completely mixed in. Watch the science experiment begin!Place into the parchment paper-lined pan and allow to cool down and set for 30 minutes. Do not touch! Those air pockets are imperative for the texture in this candy.Break with a knife once it sets and coat with melted chocolate if you desire.