Dehydrated kakiage?

I went to Japan last month and every morning we would have a bowl of udon with a kakiage on top. It wasn’t fresh but rather dehydrated. It had a similar texture to a cracker or crouton and would kind of melt into the soup as you ate it. I have been wanting to find this ever since we came back to the US but can’t find it anywhere or even its existence online. Everywhere I look it’s either how to make it fresh or buy it frozen. Does anyone know specially what it’s called, a brand or where to buy this? TY