Commentary for Pesachim 230:4

אמר להו רב פפא אדרבה הכא איתמר דאי ס"ד בעלמא איתמר למה לי תרי טיבולי

and he lectured: If he washed his hands at the first dipping- he must wash his hands at the second dipping [too]. The Rabbis discussed this before R'Papa: This was stated in general,<span class="x" onmousemove="('comment',' When a man eats vegetables at other times of the year. Since the eating of vegetables then is not statutory, each time he eats them (after dipping) even at the same meal counts as a separate act, for when he ate the first time he did not intend eating them again; hence he must wash his hands at each.');">⁷</span> for if you should think that it was stated here [in connection with Passover], why must he wash is hands twice?

Tosafot on Pesachim