Cut off the stems from the jalapenos. Slice each pepper in half lengthwise, then remove ribs (membranes) and seeds. Slice the halves crosswise to about ⅛-inch thickness.
5 medium-sized jalapeno peppers
Turn on your ventilation system because the jalapenos may release capsaicin during the cooking process that can irritate eyes, nose and throat.
Heat the oil in a cast iron skillet on high heat. The oil needs to be hot enough so that the pepper slices sizzle when you add them to the pan.
2 teaspoons vegetable oil
Add the jalapeno slices and fry on high heat, stirring frequently. Once the peppers have given off most of their moisture (after about 3 minutes), turn the heat down to medium. Continue to fry, stirring frequently, until the peppers turn soft with a char along the edges (about another 9 minutes.) Transfer the charred jalapeno slices to a bowl and let cool.
Add the chicken broth to a saucepan. Bring to a boil and cook until reduced by about half. Meanwhile chop the jalapeno slices finely.
½ cup chicken broth
Turn down the heat and stir the heavy cream into the reduced chicken broth. Stir in cumin, paprika and ancho chili.
⅓ cup heavy cream, ½ teaspoon ground cumin, ¼ teaspoon smoked sweet paprika*, ¼ teaspoon ancho chili powder
Stir the chopped jalapenos and the tomato paste into the sauce. Bring to a simmer, then take off the heat.
½ tablespoon tomato paste
Stir in sour cream and lime juice. Add more lime juice to taste.
1 teaspoon sour cream, ¼ teaspoon lime juice, more to taste
Recipe notes:
*I've made this sauce with smoked hot and with smoked sweet paprika and I recommend sweet. The flavors are a little too harsh with smoked hot paprika, in my opinion.Storage: Store the sauce in an airtight container in the fridge for up to 3 days. Gently reheat on the stovetop or in the microwave.