Hi Anna, just got back into town...here's how I adjusted Kenji's recipe
He called for specific dried chilies, but I used what I could find:
1 chili ancho (mild)
1 chili guarjillo (medium)
1 California (anaheim?) (mild)
Since this was being served to a group, I wanted to keep it in the "not hot, but still flavorful" range. Two of the chilies were rated as mild and one was medium.
I only used 2 small chipotle chilies (instead of 4) and
1 TBL of canned sauce (La Costera) (instead of 2).
To remove more heat, I pulled out all the seeds and ribs for all the chilies (including the jarred stuff).
Since I used meaty oxtails (good option) I only needed 1 TBL of oil as the oxtails gave off more fat to sauté the veggies. When all was done, I pureed in my Vitamix.
A friend suggested I use a crock pot, but 70 minutes later--on HIGH--the sauce was just warm. So I thought "enough of that" and put the meat in a dutch oven, brought the finished sauce to a boil, poured it over and started baking it. In 3 hours a metal skewer stood upright and Kenji's notes said that wasn't cooked long enough. So I baked it for another hour and the skewer slid in and came right back out. That was the sign it was done. Since I had time in the crockpot + baking, I can't give an exact length, but it was at least 4 hours. When it was cool, I put it all in the frig for our luncheon a few days later. Once cold, I skimmed off the majority of the fat on top of the dish.
I used a 4 pound shoulder and it turned out perfect. All I lost was the bones and about 4 oz of a tough grizzle. The rest shredded beautifully. To reheat I shredded it and then added sauce so it wasn't overly soupy.
Larry and I loved the finished result. I was in break room prepping the burritos for the luncheon and adding pico de gallo and sauce to each piece. I gave samples away to folks there and they raved about it. However, only one person from my group mentioned how good it was and then I left work soon afterward. Usually folks will tell you when they like stuff in the hope you will bring in even more free food. So now I'm not feeling as confident about the end result.
However, for me--with my total lack of experience cooking meat--it was definitely a win and I'd do it again the exact same way.