What foods ordinarily found in supermarkets are Jews forbidden to eat?

According to Jewish dietary laws, known as Kashrut, there are certain foods that are forbidden to eat, regardless of where they are found, including supermarkets. These foods include:

1. Pork and Pork Products: Jews are prohibited from consuming any part of the pig, including ham, bacon, pork sausages, and other derived products.

2. Shellfish: All types of shellfish, including shrimp, prawns, crabs, lobsters, clams, mussels, oysters, and scallops, are forbidden.

3. Non-Kosher Fish: Only certain species of fish that have both fins and scales are considered kosher and can be consumed. Fish without scales, such as catfish, eel, shark, swordfish, and shellfish, are prohibited.

4. Meat and Milk Mixtures: Mixing meat and milk products (including dairy) in the same meal or cooking them together is not permitted. For example, a cheeseburger or a dish cooked with milk and chicken would be considered non-kosher.

5. Blood: Consuming blood is prohibited. Foods like black pudding, which contains coagulated blood, are therefore forbidden.

6. Birds of Prey: Certain birds of prey, like eagles, hawks, vultures, and owls, are not allowed for consumption.

7. Insects: In general, insects are not permitted, with the exception of certain kosher locust species mentioned in the Torah.

It's worth noting that kosher-certified supermarkets and sections in regular supermarkets typically offer a wide range of foods that abide by Jewish dietary laws and are clearly labeled as "kosher." Adhering to Kashrut involves not only avoiding certain foods but also following specific practices for purchasing, preparing, and handling kosher food according to Jewish traditions.