I have a technique that was taught to me from a friend that grew up in Santa Barbara. Since we have a couple tip afficionados, I'll post this here.
As you may know, tri-tip comes from the San Ynez valley, in Santa Maria area. The real style uses pinquito beans, but I don't like beans, so don't make/eat those. What I do is get a tri-tip that's not trimmed, I use the fat cap to control the fire. I stab the tip with a big bbq fork on both sides, and use 1/2 - 1 bottle of original Bernsteins italian dressing in a ziploc. Let that marinade overnight if you can. Save the dressing you don't use, it is used to baste the meat as you sear it in, so it doesn't burn.
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I cook over direct heat, placing the fat cap on the fire to flare it up, and flip it to the non-fat side to sear. It is critical that you baste the tip with the Bersteins, as the oil keeps it from burning...I continue doing this until the marinade is gone, and then I cook it indirectly, in the Weber. Be really careful as you sear the tip, you can burn facial hair if you're not careful as it flares up violently as you flip to the fat cap side. I never buy a trimmed tri-tip, which is how they will sell them. Make sure it's untrimmed. You need to get the feel of the meat when it's done, I like it pink all the way through, but not red. A friend forged this steak turner for me, which I use, all the time. My daughter likes to say, you need the right amount of "jiggly" when you poke it.
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And this is how I serve it, after I let it rest and slice it. I always do tip on high heat, and have never had luck going low and slow as I would a brisket. However, there's a place in Morgan Hill named Trail Dust, and they have a low/slow tri-tip that is to die for, I just never have luck with that. I would put tri-tip not as our favorite in our house, but there was never any left, people eat it til it's gone.
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