steak sandwich

4 slices thin of fillet steak
1 red onion
2tbs Balsamic vinegar
1 sourdough loaf 
1 bunch rocket
4 ripe tomatoes
3tbs oil
4tbs aioli


Slice 8 slices of the sourdough bread and spread the aioli over one slice.
Heat a pan with some of the oil, season steak.
slice the tomatoes.
Slice the onion and place in the pan and cook, stirring frequently, until golden.
Add the Balsamic vinegar and cook until caramelised.
Remove onion for pan and set aside keeping it warm. Heat up some more oil in the pan for the steak. 
Cook steaks for about 1 minute each side or until done to your liking.
place the rocket then tomatoe slices and steak onto the slice of bread with the aioli top with caramelised onion and the other slice of bread. Serve.