Preheat oven to 150°C/300°F.
Grease a loaf tin with butter.
In a large bowl, mash up the mince using a masher or your hands. Add all the other ingredients and mix until thoroughly combined.
Cook in the oven for 1 hour.
Drain away any excess juice, then allow to rest for 5-10 minutes before slicing.
Store in an airtight container and refrigerate for up to 2 days.