Easy Balsamic Glazed Steak Tips and Mushrooms

Name: Easy Balsamic Glazed Steak Tips and Mushrooms
Yield: 4
Ingredients: 1 1/2 lbs Sirloin steak tips; 1 lb Cremini mushrooms; 2 cloves Garlic; 1 Parsley, fresh leaves; 4 tbsp Balsamic vinegar; 1 tsp Dijon mustard; 1/4 cup Tamari or soy sauce; 1/4 tsp Black pepper, freshly ground; 1 tbsp Granulated sugar; 1/2 tsp Kosher salt; 4 tbsp Vegetable oil; 2 tbsp Butter, unsalted