✅ Answer: There is no narration found in Shia sources prohibiting eating in a cemetery. Therefore, this issue, along with other matters that have no specific or general prohibition in the narrations, is unrestricted based on the following narration:

مُحَمَّدُ بْنُ عَلِیِّ بْنِ الْحُسَیْنِ قَالَ قَالَ الصَّادِقُ علیه السلام کُلُّ شَیْ ءٍ مُطْلَقٌ حَتَّی یَرِدَ فِیهِ نَهْیٌ

📚 *Man La Yahduruhu al-Faqih*, Vol. 1, p. 317

Translation: Imam al-Sadiq (AS) said: Everything is permissible (free) unless a prohibition regarding it has been reported.

✅ Important Note: The use of this fundamental principle requires sufficient knowledge and caution to be applied in the correct context.