Cut pork into small cubes.

Melt over low medium heat in a large pan.

Cook for about 1 hour, stir occasionally, until the solid pieces turn into brown cracklings.

Peel onion, and dice very finely or grate.

Peel and core apple, and dice very finely or grate.

Add onion and apple pieces to pan and keep cooking for about 10 minutes, or until the mixture starts to turn golden brown.

Let cool for about 10 minutes and pour into ramekins or canning jars.