Yes. You can buy chopped sorrel in a can or a jar in many ethnic Polish, Ukrainian or Russian stores. Add amount by heaping spoonfuls to taste and keep in mind that it has a lot of added salt to preserve it. So, you might want to salt your soup at the very end. I also do not recommend to use dried sorrel as it has very distinct bitter taste. It is not my favorite and I love this green sorrel borscht!