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1
Place all ingredients other than meat into a blender. Puree until the bits are very small.
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2
Put the meat into a 1-gallon freezer baggie. Pour the marinade into the baggie. Remove as much air as possible when you close the baggie.
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3
Refrigerate overnight. I place the baggie int a leak-proof dish to prevent spills.
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4
The next day --.
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5
Preheat oven to 500 degrees f.
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6
Place marinated tritip on a roasting rack.
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7
Roast for 10 minutes, then reduce heat to 325 degrees f.
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8
Roast for an additional 45 minutes, or until internal temperature of the roast is 135 degrees (medium-rare).
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9
Remove from oven (don't forget to turn off the oven, like me). Let it sit for 10 minutes. The roast will continue cooking to a very nice medium.
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10
Slice thinly across the grain to serve.
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11
I have also tried this on the grill. In order to cook this correctly, place all the charcoal to one side of your grill. Sear the tri-tip on the hot side, about 3-4 minutes per side, in order to get some nice sear marking, then move it to the cool side. close the cover and open the vents. Open the cover about 45 minutes later.
