1) When you make an Eruv Tavshilin you need a baked food and a cooked food. What if you have a baked potato, it's cooked and baked?
2) You have to have a Kezayis in an Eruv Tavshilin, is that a Kezayis of baked food or cooked food or both?
Aaron Pacanowski, Melbourne, Australia
1) A baked potato is considered a cooked food. The Gemara (Beitzah 16b) and the Shulchan Aruch (OC 527:5) tell us that a piece of roasted meat is considered a Tavshil (cooked food) for purposes of making an Eruv Tavshilin. This despite the fact that roasting is not considered Bishul (cooking) by the Torah as we see from the Torah's requirement to roast and not boil (Mevashel) the meat of the Korban Pesach (Shmos 12:9).
Afiya (baking) in the Torah refers specifically to things made from flour and water and baked in an oven - what we refer to as "baked goods". This is implied by the Shulchan Aruch (same :2) that says that the Eruv is made from Pas (bread) and a Tavshil.
2) You need a Kezayis of each (Shulchan Aruch, OC 527:3) and if you are Ashkenazi the baked food should be a ke'Beitzah (twice the volume of a ke'Zayis).
Y. Sigler
*This reply is not intended as a Pesak Halachah. It is only intended as a guide to the Halachic issues involved in the question.**