I saw Allah's Apostle ﷺ squatting and eating dates.  

رَأَيْتُ النَّبِيَّ ﷺ مُقْعِيًا يَأْكُلُ تَمْرًا  

Anas reported that there were brought to Messenger of Allah ﷺ dates. He distributed them in the state that he had been sitting upright (in an easy posture) and he had also been eating them a (bit) quickly.  

أُتِيَ رَسُولُ اللَّهِ ﷺ بِتَمْرٍ فَجَعَلَ النَّبِيُّ ﷺ يَقْسِمُهُ وَهُوَ مُحْتَفِزٌ يَأْكُلُ مِنْهُ أَكْلاً ذَرِيعًا وَفِي رِوَايَةِ زُهَيْرٍ أَكْلاً حَثِيثًا