Half Marinated Egg

You're referring to the elusive "Half-Marinaded Egg" phenomenon often found in restaurants in the USA! *wink*

In all seriousness, I think you might be referring to a "Deviled Egg" or a "Marinated Pickled Egg." Let me enlighten you on these tasty treats:

Deviled Egg:

A deviled egg is a hard-boiled egg that's been halved and filled with a creamy mixture of the yolk and various seasonings. The yolks are typically mashed and mixed with mayonnaise, mustard, and diced pickles or onions, then spooned back into the egg white halves. The resulting bite-sized snack is a staple at many American picnics, parties, and buffets.

Marinated Pickled Egg:

A marinated pickled egg, on the other hand, is a hard-boiled egg that's been marinated in a brine solution, often with added flavorings like garlic, spices, or hot sauce. The egg is left to soak in this flavorful liquid for several days or weeks, which gives it a tangy, savory flavor and a firm, slightly pickled texture. These eggs are commonly found in diners, delis, or sandwich shops, often served as a side dish or used as a topping for salads or sandwiches.

To further confuse the issue, some restaurants might serve a "Pickled Quail Egg" or "Pickled Egg Halves," which are quail eggs or chicken eggs that have been marinated in a sweet and sour brine. These bite-sized morsels are often served as an appetizer or used as a garnish for cocktails.

So, which one of these eggs-quisite treats do you think you might be thinking of?

(P.S. If you have any more questions or would like more information, feel free to ask!)