First saute the onion, and mushrooms in olive oil until they started to brown.
Then add sliced garlic and brown only a little
Add 1/2 a cup balsamic vinegar
Season the steak generously to make a nice crust
Smoked Spanish Paprika
Rainbow pepper, freshly ground
Peel and boil the potatoes (I used Yukon Gold, which have a great flavor)
Drain when they are cooked through
Add 1/2 cup milk (or cream, if you wish) and heat
Add tbls butter and melt
1 clove crushed garlic
1/2 cup chopped parsley
Whip it all up with an electric beater
Top with freshly grated Parmesan
Now throw the steaks on the preheated grill and get them going.
Meanwhile, the onions, mushrooms, and balsamic sauce will have reduced down to a glaze - you can always add a little water or red wine if it is too dry
Add a tblsp of butter to give it a rich and shiny finish
The steaks will be ready when they are still soft when you push on them - the firmer they are, the more well done the meat will be...
Top them with the balsamic mixture.
I served with carrots and my trick is to add some maple syrup to the pan after they are drained - let that coat the carrots, and season with salt and pepper - yum!
The dogs did not get even a bite.