Shiva Purana
पच्यते पच्यमानाच्च भवेत्पाकद्वयं पुनः ॥ त्वक् तया वेष्ट्यते पूर्वं रुधिरं च प्रजायते॥ ११॥
It is cooked and when it is cooked it should be cooked again The skin is wrapped around it and blood is produced first.
english translation
pacyate pacyamAnAcca bhavetpAkadvayaM punaH ॥ tvak tayA veSTyate pUrvaM rudhiraM ca prajAyate॥ 11॥
hk transliteration by Sanscript