Hadithcore
Mishkat al-Masabih, 4211

Ibn ‘Abbas told that the Prophet (ﷺ) was brought a dish containing <i>tharid</i>* and said, “Eat from its sides and not from the middle, for the blessing descends in the middle of it.” *Bread crumbled and mixed with soup which may have pieces of meat in it. Tirmidhi, Ibn Majah and Darimi transmitted it, Tirmidhi saying this is a <i>hasan sahih</i> tradition. In Abu Dawud’s version he said, “When one of you eats he must not eat from the top of the dish, but from the bottom, for the blessing descends from the top of it.”

وَعَنِ ابْنِ عَبَّاسٍ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: أَنَّهُ أُتِيَ بِقَصْعَةٍ مِنْ ثَرِيدٍ فَقَالَ: «كُلُوا مِنْ جَوَانِبِهَا وَلَا تَأْكُلُوا مِنْ وَسَطِهَا فَإِنَّ الْبَرَكَةَ تَنْزِلُ فِي وَسَطِهَا» . رَوَاهُ التِّرْمِذِيُّ وَابْنُ مَاجَهْ وَالدَّارِمِيُّ وَقَالَ التِّرْمِذِيُّ: هَذَا حَدِيثٌ حسن صَحِيح

References1 variant
In-Book Reference
Book 21, Hadith 48