According to your description, I think you ate sausage rubber (silicone). Only rubber will be chewed harder and harder, and the taste will not come loose. You said yes at first, maybe you haven't chewed it thoroughly, because rubber (silica gel) doesn't taste like vegetables or meat. You can eat rubber when eating hot dogs. Personally, I think there are only two situations:

1. The casings outside hot dogs (sausages) can be roughly divided into "natural casings" and "artificial casings". Natural casing is the small intestine of animals, and artificial casing is divided into "edible" and "inedible". Edible casings are made of animal skins. , also known as "collagen casing". Non-edible casings mainly include: cellulose series casings, cellophane casings, plastic casings, and illegal traders mix casings with rubber sleeves. Therefore, to eat sausage, whether it is edible or not, it is best to peel off the casing outside. And you didn't peel the casing when you ate the hot dog, which is probably a rubber sleeve used by illegal traders.

2. In the process of making hot dogs (sausages), sundries (such as plastics) fall into the sausages during the making process due to mechanical or human operation failures. If you feel bitter in your mouth because of eating this, you can keep the evidence and contact the seller or manufacturer first. If you are not satisfied, you can contact the local food and drug administration to make a food complaint.