Preheat oven to 325°F (160°C) and bake patty shells.In a skillet, melt butter and cook mushrooms gently. Set aside.In another skillet, heat olive oil. Sauté onion, sweet pepper. Add HP sauce, mustard and red wine. Reduce. Season to taste with salt and pepper. Add mushrooms leftover roast and at the last minute. Fill patty shells with beef and mushroom mixture.

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4 patty shells 2 Tbsp. (30 mL) butter 1/2 lb (225 g) mixed mushrooms (oyster, shiitake, button or other), cleaned and sliced 2 Tbsp. (30 mL) olive oil 1 onion, sliced 1/2 pepper (red, green, orange or yellow), cut into thin strips 1 Tbsp. (15 mL) sauce HP 1 Tbsp. (15 mL) Dijon mustard 1/2 cup (125 mL) red wine 1 lb (454 g) leftover roast beef, cut into strips salt and pepper to taste