Guajillo, ancho, and what each one does
Ok so now that you know how to toast em without turning your kitchen into a smoke detector test (that's a different chile, dont worry, we'll get there) let's talk about which dried chiles actually go in this marinade and why.
For al pastor you basically need two: guajillo and ancho. You could go down a rabbit hole with a dozen other dried chiles and people do, but for this recipe these two are doing all the real work. Everything else is optional dress-up.
Guajillo — the backbone
Guajillo is the reddish-brown, kind of shiny one, long and skinny, maybe 4-5 inches. When you toast it and soak it and blend it, it gives you color and a bright, almost tangy sharpness. Its not very hot. Mild heat, big color. This is what makes al pastor look like al pastor — that deep red-orange you see at every taco stand.
If you only used guajillo the marinade would taste a little thin. Good color, decent tang, but flat underneath. Thats where the second chile comes in.
Ancho — the body
Ancho is the wide, dark, wrinkly one. It's a dried poblano, actually, which is a fun fact I only half remember correctly so dont quote me on the history of it. What matters is what it does: ancho brings sweetness and this kind of raisiny depth. Its mild too, milder than guajillo even. But it fills in the middle of the flavor where guajillo leaves a gap.
Guajillo without ancho is sharp and a little hollow. Ancho without guajillo is sweet but muddy, no lift to it. Together you get both ends covered. That's the whole reason the classic marinade uses both instead of just doubling up on one.
What each one is doing, side by side
- Guajillo: color, brightness, mild tang, thinner texture once blended
- Ancho: sweetness, depth, body, slightly thicker and darker once blended
Ratio-wise I usually go about 4 guajillo to 2 ancho for a batch that'll do 2-3 lbs of pork. You can nudge that around once you've made it a few times and know what you like. First time through, just follow the ratio and taste at the end.
Prepping them right
Same toast as we already covered — dry pan, no oil, medium heat, about 30 seconds a side until they smell awake and get a little shiny and pliable. You're not trying to cook them, just wake up the oils.
After toasting, stem and seed them, then soak in hot water for about 15-20 minutes until soft. They should bend without cracking. Then into the blender they go with your soaking liquid, garlic, vinegar, achiote, the works — we'll build the full marinade next lesson.
Here's the thing though. Guajillo and ancho both scorch faster than you expect, and once one goes bitter it drags the whole batch down with it. I mentioned the trick is stopping the second they smell awake — well I learned that the hard way with poblanos, not even these two, and it wasnt subtle.
I was charring poblanos straight on the gas burner one time, no plan, no fan on, didnt even think about it. Dry air up here doesnt hold smoke down at all, it just goes straight up and fills the room, and about ninety seconds in my detector went off so loud I dropped the tongs. Ximena came running in from the other room asking what was on fire. Nothing was on fire. I just didnt crack a window first.
So even with the dried chiles, which make way less smoke than a raw poblano over open flame, I still crack a window before anything touches heat now. Its a small habit but it saves you a headache, and it saves your smoke detector a nervous breakdown.
My opinion on this, since you asked (you didnt ask)
People assume more chiles equals more flavor. It doesnt. Guajillo and ancho done right, toasted correctly, seasoned correctly, will beat a marinade with six different chiles thrown in because somebody panicked. Two chiles, done with attention, beats six done carelessly every time. Same idea as char — its not about piling stuff on, its about pushing what you've got the right amount.
Before next time: if you can get to the store before our next session, grab a bag of each — guajillo and ancho — so you've got your own on hand and aren't sharing a bin with six other people at your station. 👍