Mix one part baking soda with three parts (pure, 100%) maple syrup in a small saucepan.
The next set of instructions came from an email regarding the mixing of the baking soda and maple syrup:
"I started it on high heat in a small stainless steel pot, stirring and watching it carefully. When it started to froth, I turned it down to medium heat and cooked it while stirring for five minutes. As the froth rose, I lowered the temperature enough to keep it frothing, but not to let it boil over. I decided that I wanted it to cook for five minutes after it started frothing to make sure it got fully combined. Then I let it cool before putting it in a glass jelly jar that I previously washed carefully and dried."
Do NOT refrigerate this mixture. Keep it at room temperature, in a dark area, and use it until it starts to separate in two or three days, then make another batch.