Reduce Cooking Time By Up To 40% By Creating "Heat Channels". More Even Cooking; Reduced Shrinkage And Easy To Clean. Pull Out The Plunger And Pour Marinade Or Sauce Into The Tube. Then Put The Plunger Into The Tube And Press It.You Can Also Put The Marinade In A Container And Suck The Marinade From The Container. The Marinade Or Sauce Will Permeate Into The Meat When You Tender It.