Bacon and brassicas are best friends. Here's a very simple recipe which is popular in the Finch household.
Chop the onion
Slice the cabbage to make strips about 1cm wide
Cut up the bacon to make lardons
Get a large pan that is big enough to hold all the cabbage. Heat the fat, press in the garlic, then bung in the onion and bacon. Fry over a moderate heat until the bacon is cooked.
Add the cabbage. Stir to mix everything together and keep stirring so it cooks evenly. As the cabbage cooks down and becomes more manageable you can put the heat right up to brown it slightly. Keep stir-frying until the thick ribby parts of the cabbage are soft as you like, usually several minutes. (I haven't timed it since I taste to decide when it is done...)
I serve this as a main dish with just a few dollops of sour cream on top and plenty of black pepper.