It says in 'Ryori Monogatari' (Tale of cooking), a book written before 1643, that soba dipping sauce can be made by adding the juice of piquant "daikon" (Japanese radish) to taremiso (for udon) or to ninuki, and that one can add other ingredients to the sauce for flavor, such as, shaved pieces of dried bonito, grated piquant daikon, chive, mustard, and Japanese horseradish.
寛永20年（1643年）以前に書かれた書物「料理物語」中にそばつゆに関して、うどんのたれみそもしくは煮貫に大根の汁を加え、鰹節・大根おろし・あさつきにからし・わさびを加えてもよいと書かれている。