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I am working on an app that allows users to enter in recipes. I have access to some data about certain ingredients that the user can select for the recipe, such as if the ingredient is kosher. If all ingredients selected for a recipe are kosher, is the entire recipe kosher? Or are there other rules, such as how the ingredients are prepared or what pot the dish is cooked in, that will make a dish non-kosher even if all the individual ingredients are kosher?

While some recipes will be available to the general public to make themselves, most recipes are used by employees to make dishes that will be for sale.

Note: I'm sorry if this question is really un-informed. I am a non-Jew and am trying to understand kosher rules and just want to make sure I'm doing everything right.

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    What is your goal in developing the app? People who keep kosher know how to use non-kosher cookbooks, making substitutions as may be needed. – Yehuda W Sep 17 '15 at 15:39
  • @YehudaW It could be very useful for finding disguised non-kosher ingredients on commercial packaging. – Double AA Sep 17 '15 at 16:13
  • @DoubleAA Would the app have the product name and manufacturer for all packaged goods? Even if it did, some products have both hechshered and non-hechshered versions, like baby foods (some have a hecksher and some do not). It is an impossible task for an app. – Yehuda W Sep 17 '15 at 16:45
  • @YehudaW The app would just list ingredients that have complicated names and tell you what they are and if there are Kashrut concerns associated with them. Simple. Nothing about manufacturers. For instance, it might say 'dextrose' is just starch, while 'stearate' could come from catfish. – Double AA Sep 17 '15 at 16:47
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    Depending on the user-base, a filter for "kosher" in such an app could be quite useful, if "kosher" is clearly defined to mean "assuming kosher versions of all listed ingredients are used in a kosher kitchen, could be prepared as a kosher dish," and if it returns "true" as long as the ingredients don't contain any inherently non-kosher ingredients and don't contain both meat and either one of fish or dairy. – Isaac Moses Sep 17 '15 at 17:22
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It is a start. However it must be cooked in Kosher pots & pans. Meat & Dairy, Meat & Fish should not be combined. There are other rules such as Bishul Yisrael, Pas Yisrael, Yayin Nesech that can affect this. Also vegetables and fruits in many instances require checking for insects. Blood spots in an egg can be a problem. Meat and chicken require slaughtering according to Halacha.

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