Season the pork tenderloin well with salt, pepper, garlic salt and the montreal steak spice. Heat up 2 Tablespoons of olive oil until nice and hot in a pan. Sear the tenderloin on all sides. put the whole pan in the oven (make sure you don't have a rubber handle or it will melt!!) Cook for 10-12 minutes at 375 degrees Celcius. The pork can be slightly pink!

For the onion butter,toss the chopped onions in the olive oil and season with salt and pepper. Put on a roasting pan and cook in a 350 degree Fahrenheit oven, stirring occasionally.

After about a half hour the onions should be a light brown. Cook for another 10 minutes and then add in the chopped garlic. Make sure at this point to stir a lot as the garlic can burn even easier than the onions!

Once the onions are a beautiful golden brown, add into a blender and add just a spoonful of water at a time until the onions are pureed fairly smooth. Add in the cold butter and lemon juice and blend until thoroughly combined. Add another spoonful of water if you need to!