Related for Chullin 7:5
גִּיד הַנָּשֶׁה שֶׁנִּתְבַּשֵּׁל עִם הַגִּידִים, בִּזְמַן שֶׁמַּכִּירוֹ, בְּנוֹתֵן טַעַם, וְאִם לָאו, כֻּלָּן אֲסוּרִין. וְהָרֹטֶב, בְּנוֹתֵן טָעַם. וְכֵן חֲתִיכָה שֶׁל נְבֵלָה, וְכֵן חֲתִיכָה שֶׁל דָּג טָמֵא, שֶׁנִּתְבַּשְּׁלוּ עִם הַחֲתִיכוֹת, בִּזְמַן שֶׁמַּכִּירָן, בְּנוֹתֵן טַעַם. וְאִם לָאו, כֻּלָּן אֲסוּרוֹת. וְהָרֹטֶב, בְּנוֹתֵן טָעַם:
When the גיד הנשה [sciatic nerve] was boiled with other sinews, if that sinew can be recognized [it must be removed, and] the other sinews are prohibited, if it could have imparted a flavor to them. But when it cannot be recognized, all the sinews are prohibited. The broth [or liquid in which it is boiled] may not be used if the גיד הנשה [sciatic nerve] imparted a flavor to it; and it is even so if a piece of Nebelah, or of a fish prohibited to be eaten, should have been boiled with other pieces of meat or fish allowed to be eaten: if the first mentioned pieces can be recognized, they are to be removed, and if they could have imparted a flavor to the other pieces, the latter may not be used. If they could not be recognized, all the pieces are prohibited; and thus in respect to the broth, which may not be used, if the flavor of the prohibited pieces could have been imparted to it.