Beef and Mozzarella Dip Sandwich with Caramelized Onion

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Step 1

Preheat oven to 450. Halve and peal onion. Thinly slice. Separate steak strips into a single layer and pat dry. Coarsely chop. Season all over with a pinch of salt and pepper.

Step 2

Place a large skillet over medium heat and add 1 tbsp olive oil. Add onion to hot skillet and stir occasionally until browned. Add streak strips and add half the mushroom seasoning until no pink remains. Remove from burner. Rest, 3 minutes.

Step 3

Halve french rolls. Top cut sides with 2 tsp olive oil. Massage oil into bread. Place rolls directly on oven rack, cut side up, in hot oven, and bake until slightly toasted, 2-3 minutes.

Step 4

Carefully remove from oven. Place toasted bottom rolls, cut-side up, on baking sheet (can set aside top rolls). Top evenly with steak strips and cheese. Bake in hot oven until cheese is melted, 2-3 minutes While sandwiches toast, make dip.

Step 5

Combine butter and remaining seasoning blend in a microwave-safe bowl. Microwave until butter is melted, 20-30 seconds. Stir in demi-glace and 1/4 cup water. Microwave again until warm, 30-60 seconds.