I think the best bet would be following recipes. That means finding recipes that minimize ‘to taste’ instructions. A lot can be done by look and texture, so you can be decent enough for anyone who’s not a snob. Also, err on the side of too little salt and put some on the table.
Roundup is a systemic herbicide. You have a chance of killing the parent plant since they share roots. It probably won’t, but it seems pretty drastic when you could just pull any shoots. You can even pot them up and give them to friends.