Цитата к Ошеа 9:4

The measure of an eruv tavshilin is not less than a kazayit (the mass of a large olive)—whether it is for one or for thousands. And we do not make this eruv with bread nor with groats, but rather with a dish which is an accompaniment (to the bread)—such as meat, fish, eggs and that which is similar to them. For an eruv tavshilin, one can even rely upon lentils at the bottom of the pot, and even upon the fat on the knife when he cuts the roast—he may rub it off [for this purpose], if there is a kazayit of it.

The dish that they spoke about regarding this eruv can even be roasted, even boiled, even pickled or smoked. One may surely even rely upon small fish that were rinsed with hot water, and their rinsing is their cooking.

And this eruv needs to be in existence until one bakes all that he needs to bake and to cook all that he needs to cook and heat all that he needs. But if the eruv was eaten or lost or burnt before he cooked or baked—such a one is surely forbidden to bake and to cook or to heat, except for that which he is eating on the holiday alone. [However,] if he started on his dough or his dish and the eruv got eaten or lost—such a one can surely finish [the task].