Reference for Pesachim 228:6

תנאי היא דתניא רבי יוסי אומר אע"פ שטיבל בחזרת מצוה להביא לפניו חזרת וחרוסת ושני תבשילין

Moreover, it was taught: If he ate them [the bitter herbs] while demai,<span class="x" onmousemove="('comment',' V. Glos.');">⁸</span> he has discharged [his duty]; if he ate them without intention, he has discharged [his duty]; if he ate them, in half quantities,<span class="x" onmousemove="('comment',' I.e., as much as half an olive the first time and the same the second time, as much as an olive being the minimum quantity which must be eaten.');">⁹</span>

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