A real camera perhaps.

I'm sorry but I can't figure out a better way if you really want a truly shallow focus. Software blurring only goes so far, and it is often hit-and-miss, rarely giving an acceptable result.

Here's a photo I took 8 years ago with a pocket camera that was nowhere near to getting a decent blur. I edited the "bokeh" in, and tried emulating the plane of focus (badly):

Looks very artificial if you ask me, and nowhere near to the quality I can get from the Canon with a good glass.