Greaves, it is basically salted beef or pork fat cut in small pieces and slow cooked, when all fat renders it leaves the crunchy fried solids. The best snack ever, It is amazing and you can use the tallow/lard for cooking later.
My <2 years Son loves them.
https://images.app.goo.gl/fM6p62JtYoWZkBpv5