1 Tbsp. butter
8 oz. sliced mushrooms
½ vidalia onion, sliced
¼ c. Guinness
1 package sandwich rolls (I used King's Hawaiian Savory Butter Rolls)
¾ lb. sliced roast beef
6 slices swiss cheese
1 bottle Guinness (or use the remainder of the bottle used for mushrooms & onions)
1 stick butter
¼ c. brown sugar
1 Tbsp. dried mustard
1 tsp. onion powder
2 cloves garlic, minced
In a medium skillet, melt butter over medium-high heat. Add mushrooms, onions and ¼ c. Guinness and saute until liquid is absorbed.
Prepare glaze by combining all ingredients in a medium saucepan.
Bring mixture to a boil, then lower heat slightly and cook until thickened. (*Mixture should be reduced by at least half - when in doubt, reduce it a little more!)
Assemble sandwiches by slicing rolls in half, then filling with roast beef, sautéed mushrooms & onions, and swiss cheese.
Pour glaze evenly over sandwiches.
Bake, uncovered, at 350 degrees for 30 minutes.