The term 'Shaker Fill' refers to a type of crossword puzzle in which the answers are related to a specific theme. In this case, the answers are 'PEPPER' (6 letters) and 'SALT' (4 letters). The Shaker Fill is a popular type of crossword puzzle because it requires the solver to think outside the box and come up with creative solutions. PEPPER and SALT are two of the most common seasonings used in cooking, and they are often used together to enhance the flavor of dishes. They are also used to add color and texture to food.