Taming with Fresh Sorghum is twice as fast as taming with normal crops (e.g. Rockarrot) by using the same amount. If you don't have the right kibble it's the best way to tame herbivores, although taming effectiveness can drop really low.
Spinach, Lettuce and Sorghum restore 20 food points during taming process. You need the same amount of spinach as you would need basic crops, but crops restore 40 points. That's why taming with spinach is twice as fast.
The Biscuit Batter item description reads "Refined syrup made from Sorghum." but doesn't currently use Sorghum in the recipe.