You can use pork or chicken
I boiled 8-9 chicken thighs with skin and bone in Water and chicken broth. Add a whole onion, head of garlic, and a bay leaf. Boil until chicken is falling off bone. Remove the bone and shred the chicken.
I fire roasted 3 Anaheim peppers and set them in a bag to steam. When they’re done remove the charred skin.
Then I boiled half an onion, 10-13 tomatillos, and 3 jalapeños. When the skin from the tomatillos turn a pale green remove all boiled ingredients and Add to a high speed blender with 1 bunch of cilantro, salt, chicken knorr, pinch of cumin, a little bit of chicken broth, 3 fresh garlic cloves, and oregano.
When done blending strain and add to a pan with oil and simmer.