Probably cornstarch to thicken it. First time I bought "real" syrup I was confused why it was so runny compared to what I grew up with. Ahh, I been eating fake maple syrup.
When a whee little lad, my grandfather would have me help him boil down Maple tree sap to make it ourselves. it took 40 to 50 gallons of sap to make one gallon of syrup. Depended on how dark you wanted it. Had some new neighbors move in, city slickers, who started to copy us,but they started to tap PINE trees!
