What is the base for the onion dip served with house potato chips?

The base for the onion dip served with house potato chips is mayonnaise. Mayonnaise provides a creamy texture that contrasts nicely with the crispness of the potato chips, enhancing the overall mouthfeel of the dish. Additionally, mayonnaise typically has a mild flavor that complements the taste of the onion without overpowering it. This allows the dip to highlight the sweetness and savoriness of the onions, creating a harmonious balance.

The use of mayonnaise in dips like this is quite common due to its ability to emulsify ingredients and create a smooth, rich consistency, making it an ideal choice for a dip intended to accompany crunchy snacks. It also allows for seasoning variations, so various herbs and spices can be added to enhance the onion flavor further.