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1
Remove the stem and seeds, then julienne 3/4 of the bell pepper; rough chop the final 1/4 and set both aside.
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2
Julienne 3/4 of the red onion; rough chop the remaining 1/4 and set both aside.
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3
Peel the garlic and squish it well with the flat of your knife.
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4
Set aside.
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5
Mix together the horseradish, mayo and Dijon mustard in a small bowl and set aside.
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6
For the Au Jus: In a small pot, over medium heat, saute the rough chopped peppers and onions and the garlic clove using the teaspoon of olive oil, just until the onion is getting translucent.
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7
Add either 1 sprig of fresh rosemary OR 1/2 teaspoon dried rosemary, the red wine and the beef broth.
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8
Season to taste with a few splashes of Worcestershire sauce, sriracha or Tobasco sauce, and salt and pepper.
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9
Let simmer while you finish preparing the rest of the ingredients.
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10
In a skillet over medium heat, saute the julienned peppers and onions in 1 tablespoon of butter and 1 tablespoon of olive oil until the onions are just starting to caramelize, about 5 minutes.
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11
Season with salt and pepper to taste.
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12
Soften the half-stick of butter and generously butter the sandwich rolls.
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13
Lay them out (all 4 halves, butter-side-up) on a sheet pan and toast under the broiler until golden brown.
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14
Spread all four halves (tops and bottoms) with the horseradish mix.
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15
Add the thin-sliced roast beef to the au jus just long enough for the beef to heat up.
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16
Arrange the bottom halves of the sandwich rolls on an oven-safe dish.
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17
Layer 4 ounces of meat on each sandwich.
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18
Top each sandwich with half of the peppers and onions.
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19
Arrange 4 ounces of the cheese of your choice on top of each sandwich, covering as much surface area as possible.
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20
Pop the sandwiches under the broiler just until the cheese is gooey.
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21
Top with the remaining bread and serve with a cup of the au jus for dipping.
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22
These sandwiches are the perfect combination of a really nice French Dip and lovely Philly Cheesesteak.
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23
For a crowd pleasing dinner or lunch, serve with a tossed salad and a generous helping of sweet potato fries.
