Rauchbier Marinated Sirloin Steak with Mushroom Mashed Potatoes

Okay, so I marinated some steak in Aecht Schlenkerla Rauchbier Märzen. Can't really say I know how to pronounce that, but anyway smoked beers are pretty interesting and I've been meaning to make something with one for a while. They smell like a campfire and taste like smoked meat or bacon. So the other night when I wanted to make steak for dinner I remembered the smoked beer I had left in my fridge. I marinated the meat in the beer along with some Worcestershire sauce, soy sauce, and some other flavors. I was actually really surprised at how much of the smokey flavor came through. The mashed potatoes I made with mushrooms were also a pretty big hit. Pretty enjoyable meal I'd say.

1 pound top sirloin fillets
1/2 cup smoked beer
1 tsp minced garlic
1 tbsp Worcestershire sauce
1 tsp balsamic vinegar
1 tbsp Dijon mustard
1 tbsp soy sauce
garlic powder
black pepper
1/4 of a red onion
Canola oil

mashed potatoes:
3 potatoes
6 medium size white mushrooms
3/4 cup evaporated milk
3 tbsp butter
1/4 red onion
garlic powder
salt to taste
1 tbsp minced parsley

Combine the balsamic vinegar, garlic, beer, soy sauce, and Dijon mustard in a large bowl. Season the meat with the thyme, parsley, garlic powder, salt, and black pepper. Place in the bowl and turn over to make sure it gets covered in the beer mixture. Cover and leave to marinate for a few hours. In the mean time make the mashed potatoes. Make holes in all the potatoes and microwave them for 5 minutes on each side. Peel off the skin and mash into a bowl with a fork. Add in the butter, milk, parsley, garlic powder, and salt. Chop the onion and the mushrooms and cook in a little bit of butter on medium heat for about 10 minutes. Mix the mushrooms into the mashed potatoes. Heat some oil on a large pan and place the steak and onion in it. Brown on both sides and cook on medium heat until desired doneness. Slice the meat and serve with mashed potatoes.