500g thinly sliced reindeer meat
2 tbsp butter (for authentic Finnish flavour)
Salt and black pepper
1 large onion, finely chopped
Optional: 1/2 cup dark beer or beef stock
Optional: 1/4 cup heavy cream for richness
Optional: 1 diced carrot, 1/2 cup shredded cabbage for depth
Optional: cooking time 40 minutes to 4 hours