Reference for Pesachim 230:8

רב הונא אומר כולהו נמי לפני מי שאומר הגדה והלכתא כרב הונא

if he swallows bitter herbs, he does not discharge his duty.<span class="x" onmousemove="('comment',' Because he has not tasted its bitterness, which is essential. Rashi reads: if he swallows bitter herbs, he has discharged his duty because even then he cannot altogether avoid tasting its bitterness.');">¹⁴</span> If he swallows unleavened bread and bitter herbs [together], he discharges his duty of unleavened bread, [but] not his duty of bitter herbs. If he wraps them in bast and swallows them, he does not discharge his duty of unleavened bread either.

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