Throw some olive oil in a saucepan and add your fennel seeds and bacon, chopped up, to it. (I skipped the whole chopping the bacon bit cause I used one of those packs of pre-chopped bacon bits.)
When it's all brown, then add in your sliced onion and cook for another few minutes. Stir it often!
Add in the peeled and chopped into chunks apple, stir about a bit. Then throw in the cabbage which you've roughly chopped.
Add the balsamic vinegar, cover the saucepan, and cook on a low heat for about an hour. Stir it every once in a while to make sure it doesn't stick to the bottom of the pan or anything!
I threw in about a tablespoon of butter at the end of the cooking - cause I like butter. And it was rather nice and made it all shiny.