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1
For the steak: To a large resealable bag, add the red wine vinegar, hot sauce, 1 teaspoon salt, Worcestershire sauce, paprika, 1/2 teaspoon black pepper and lime zest and juice.
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2
Mix together and add the flank steak.
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3
Marinate for 1 hour in the refrigerator.
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4
Preheat the grill to medium-high.
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5
Remove the steak from the marinade and discard the marinade.
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6
Pat the steak dry and sprinkle with salt and pepper.
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7
Grill over medium-high heat until cooked to medium-rare,
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8
5 to 6 minutes per side.
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9
Let rest 10 minutes, loosely covered with aluminum foil, before slicing.
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10
For the gravy: In a large pan with straight sides, add the butter, olive oil, onions and thyme.
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11
Season with salt and pepper and cook over medium heat until the onions are tender and translucent, about 5 minutes.
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12
Add the mushrooms and garlic, season with salt and cook gently until the mushrooms are tender and darkened, about 5 minutes more.
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13
Add the Worcestershire sauce and horseradish.
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14
Sprinkle the flour over the entire pan.
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15
Stir to help the flour to soak into the vegetables and cook a minute more to lose the flour flavor.
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16
Raise the heat to medium-high and add the beef stock.
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17
Cook until slightly thickened, then slowly stir in the heavy cream.
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18
Simmer until the cream is thickened slightly, about 4 minutes more.
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19
Taste and season with salt, if needed.
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20
For the toast: Preheat the oven to 350 degrees F or a grill to medium heat.
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21
Arrange the sliced bread on a baking sheet lined with aluminum foil.
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22
In a small pot, add the butter, onion powder, thyme and garlic and season with salt.
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23
Heat over medium-low heat until the butter is melted.
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24
Brush the garlic butter evenly onto the bread.
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25
If baking, place in the oven and bake until the edges are golden, about 10 minutes.
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26
If grilling, place the bread slices buttered-side down on the grill and grill until toasted and grill marks appear, 2 to 3 minutes.
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27
To serve, layer the toast, then slices of beef and pour over a spoonful of gravy.