What condiments require refrigeration?

1. Mayonnaise: Mayonnaise is an emulsion of oil and egg yolks, which can provide a favorable environment for the growth of bacteria. It should be refrigerated to prevent spoilage.

2. Salad dressings: Salad dressings, especially those containing mayonnaise or dairy products such as ranch or Caesar dressings, require refrigeration to maintain freshness and prevent bacterial growth.

3. Dairy-based dips and spreads: Condiments like sour cream, cream cheese, yogurt-based dips, and hummus need refrigeration to prevent the growth of harmful bacteria.

4. Fresh herbs and pesto: Fresh herbs and homemade pesto made with fresh basil, garlic, and olive oil should be refrigerated to retain their flavor and prevent wilting or spoilage.

5. Opened jars of pickles and olives: After opening, jars of pickles and olives should be refrigerated to maintain their quality and prevent the growth of bacteria.

6. Opened bottles of ketchup, mustard, and barbecue sauce: Once opened, ketchup, mustard, and barbecue sauce should be refrigerated to preserve their flavor and prevent spoilage.

7. Opened jars of salsa and guacamole: Salsa and guacamole, especially those made with fresh ingredients, should be refrigerated to prevent spoilage and the growth of harmful bacteria.

Remember to always check the label of a particular condiment for specific storage instructions. Some condiments may have different requirements based on their ingredients and packaging.