As I mention in the post, I'm looking to replicate the flavor of a sour orange (kind of). I use a combination of citrus or even whatever I have on hand. On photo day, I used 1/2 ruby red grapefruit, 1 orange, and 1 lemon, and it measured right at 3/4 cup. This will vary, but it doesn't have to be exact!
Chipotle and ancho are pretty spicy. If you are concerned about the heat level, you may want to cut the amount in half the first time.
I almost always reach for the boneless pork chops and trim the fat. I like them as thick as I can get them, and I aim for 6 ounces per serving. You can substitute chicken thighs or chicken breasts, but be sure to adjust cooking time.
See this video for help with the chiles.