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Add a teaspoon of beef fat to a sauce pan and set over medium heat.
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Add carrots, celery and onion to beef fat and fry for a couple of minutes till fragrant.
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Add tomato paste and fry for another couple of minutes.
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Pour in beef stock and add bay leaves, thyme and leek.
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Raise heat to high and let stock come to a boil.
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Once boiling, reduce heat back down to medium and allow to reduce at a low boil for about an hour or until reduced by about half.
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Strain and set liquid into a bowl, making sure to press down on the solids as you do to release as much flavor as possible, then discard the solids.
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Return sauce pan to medium heat and add remaining tablespoon of beef fat.
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Once fat has melted, stir in flour with a whisk to form a basic roux.
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Cook roux, stirring frequently so it doesn’t burn, for about 5-10 minutes until it develops a nutty aroma and a redish-brown color.
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Carefully an gradually stir in warm beef stock mixture whisking constantly to dissolve any lumps that may occur
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Bring sauce to a boil, back heat down to low and let simmer for about 10 minutes.
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If serving the Sauce Espagnole as is, season to taste with salt and pepper and serve over beef.
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If you plan to create a derived sauce, hold back the seasoning until your final results have been achieved.