Kinder Surprise chocolate eggs
Those who have traveled in Europe know how popular Kinder chocolate is, but the main reason it hasn't gained traction in the U.S. is because not all of Kinder's products are legal here. Specifically, the hollow Kinder Surprise eggs are prohibited in the states because they contain non-edible items inside them. Here's the good news: A different version of Kinder eggs, called Kinder Joy, should become available in the U.S. sometime in 2018. These also contain a surprise toy, but their packaging seals both halves of the hollow egg to keep the toy away from the rest of the candy, making them fully compliant with FDA regulations.
12 Foods You Never Knew Were Illegal in the U.S., Source:https://www.rd.com/list/foods-illegal-united-states/