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Combine the first seven ingredients in a large zip lock bag, shake well, then add the tenderloin.
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Marinate the tenderloin in the refrigerator for 8 hours, turning occasionally.
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Remove the tenderloin from the bag and put the marinade in a saucepan.
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Bring to a boil (reduce) and set aside.
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Place the tenderloin in a roasting pan.
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Bake at 400 degrees for 45-55 minutes.
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Baste occasionally with marinade.
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In the last minute or so cover the tenderloin with the marinade and let baste on.
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Remove from oven and let stand for 10 minutes before slicing and serving.
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While the tenderloin is cooking, prepare the Royal Butter by combining all of the ingredients and beating at medium speed until well blended.
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Serve at room temperature.
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Makes 2 cups.
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You may want to adjust this recipe for the size of the tenderloin you are preparing.
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Top each serving of tenderloin with the Royal Butter and ENJOY!