add flour and whisk until well combined, about 1 minute
add remaining ingredients except for salt and pepper, whisk, bring to boil, then reduce to a simmer
simmer for 10 minutes or so, until thickened, whisking occasionally
season with salt and pepper
this can be stored for up to 2 weeks in the refrigerator. It also freezes well
Notes
Many of the Pork Carnitas recipes in this section call of Enchilada sauce. Homemade truly is so much better than store-bought and it's really fast and easy.