Final answer:
The syrup and sauce rule for a blender Dutch frost and soda relates to the viscosity of the liquids being used in the drink.
Step-by-step explanation:
The syrup and sauce rule in relation to a blender, such as for a Dutch frost and soda, pertains to the viscosity or thickness of the fluid being blended. Syrups, like maple syrup, have higher viscosity due to their thicker consistency, while sauces, such as marinara sauce or meat sauce, can also vary in viscosity depending on their thickness. When using a blender to make a Dutch frost and soda, it is important to consider the viscosity of the syrups and sauces being used, as this can impact the blending process and the final consistency of the drink.