Heat a tablespoon of oil in a frying pan over medium heat. Cook the sausages or boerwors until nicely browned.
Clean the pan or at least scrape off the bits and pieces from the sausages. Add another tablespoon of oil and butter. Let the butter melt. Once melted, add the chopped onions and cook until they are tender and slightly brown, and caramelized.
TIPS & TRICKS
You may use other sausages, like the breakfast variety, for this too.
To slice the sausages easily, place the sausages in the freezer and freeze just until they begin to harden (not frozen). It should be easier to cut them after that.