Talmud (Rodkinson Edition) — Book 2…
“ If there is sufficient of mixed eatables for two meals they may be used for an Erub. R. Joseph meant to say: "If there is enough of each kind for one meal." Said Rabba to him: "Nay; it is sufficient if there was enough of each kind for a half, a third or even a quarter of a meal."Rabh said: "One may make an Erub with wine of the quantity of two quarters of a lug." Must we have so much? Did we not learn that R. Simon ben Elazar said: "With sufficient wine necessary for the eating of two meals," and by that he means boiled wine in which bread sufficient for two meals is soaked. ”
