My husband and I came up with this open-faced sandwich when we had a bunch of steak left over from the night before. These are truly delicious!
1 tbsp oil
1 medium onion, sliced thinly in half-rounds
splash of white wine - optional
8 oz leftover steak, sliced thinly
4 slices of bread (preferably a nice crusty loaf)
1/2 stick garlic butter
3-4 oz old white cheddar, or swiss cheese, sliced thin (or grated)
Heat 1 tbsp oil over medium heat in a small skillet. Add onions and saute 'til golden brown, soft and caramelized. If desired, deglaze pan with a quick splash of white wine. Remove onions to a bowl & set aside.
Return pan to heat. Let warm and add sliced steak. Stir quickly to heat through, remove from heat.
Lay bread on a baking sheet. Spread top side with garlic butter. Layer with warm steak, caramelized onions, and cheese.
Stick under broiler for a couple minutes, until cheese is melty and bubbly. Serve!